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# a car travels 3 km in 10 minutes to reach the destination. on the return journey, the car travels the same distance in 15 minutes. what is the average speed of the car in its entire journey?

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### Mohammed

Guys, does anyone know the answer?

get a car travels 3 km in 10 minutes to reach the destination. on the return journey, the car travels the same distance in 15 minutes. what is the average speed of the car in its entire journey? from screen.

## A car travels the first one third of a certain distance with a speed of 10 km/hr, the next one third with a speed of 20 km/hr and the last one third distance with a speed of 60 km/hr The average speed of the car for the whole journey is

Click here👆to get an answer to your question ✍️ A car travels the first one third of a certain distance with a speed of 10 km/hr, the next one third with a speed of 20 km/hr and the last one third distance with a speed of 60 km/hr The average speed of the car for the whole journey is Question

A

B

C

D

## 36 km/hr

Medium Open in App

Updated on : 2022-09-05

Solution Verified by Toppr

Correct option is A)

Let the total distance travelled be x km Then total time taken =

10 x/3 ​ + 20 x/3 ​ + 60 x/3 ​ = 30 x ​ + 60 x ​ + 180 x ​ = 180 6x+3x+x ​ = 180 10x ​ = 18 x ​

hrs Then average speed = =

Totaltimetaken

Totaldistancetravelled

​ = x/18 x ​ km/hr = 18 km/hr

593 48

स्रोत : www.toppr.com

## A car travels a certain distance at 24 km/h and comes back at 36 km/h. What is the average speed of the car for the total journey.?

Answer (1 of 9): It is the harmonic mean of 24 and 36 gives the avg speed in the total journey and hence it is 2/{(1/24)+(1/36)}=144/5=28.8 kmph. Ans.. A car travels a certain distance at 24 km/h and comes back at 36 km/h. What is the average speed of the car for the total journey.?

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Sort Jayanth Mankavil

Studied at Little Flower English Medium School, Nilambur3y

Here is a simple equation

V average = 2V1V2/(V1+V2)

Here V1 = 24km/hr V2= 36km/hr

Substitute these values in the equation, you will be getting 28.8km/hr as the answer.

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A car travels a distance of 100km at the speed of 25 km/h. It covers the next 25 km of its journey at the speed of 5 km/h and the last 50 km of its journey at the speed of 25 km/h. What is the average speed of the car?

Rahul Rai

B. Tech from G.B Pant University of Technology, Pantnagar, Uttarakhand (Graduated 2018)3y

Ans is 28.8 km/h.

Assume the distance for one side is ‘s’. Therefore the total time taken for forward and backward journey is (s/24)+(s/36) which equals 5s/72.

Av speed = total distance /total time

Here total distance is 2s (forward and backward)

So, av speed= 2s/(5s/72) which equals 28.8 km/hr.

Pandita Rahul

Lived in Anantnag, Jammu and Kashmir, IndiaAuthor has 231 answers and 514.7K answer views3y

Use formula 2xy/x+y, where x and y speeds

Avg speed= 2×24×36/24+36=48×36/60=28.8 km/hr

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Abhilash Kumar

Design Engineer (2018–present)3y

where s s

equals the average speed,

a a

equals the speed for the first half of the distance, and

b b

equals the speed for the second half of the distance

Therefore, s=(2*24*36)/(24+36)

s=28.8 Kph

(Source:How to Calculate Average Speed

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Let the distance be x, the time taken for going =x/24 and the time taken for coming back is x/36. Therefore the total time taken is x/24+x/36= 5x/72. In this time, the car covered 2x distance (going and coming back). Therefore average speed = 2x/(5x/72)=144/5= 28.8km/h

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Former Retired, former Engineering Company directorAuthor has 984 answers and 259.1K answer views4y

Related

A car at an average speed of 80 km/h for 2 hours. What distance does the car travel?

One has to wonder at someone who posts on here is unable to simply multiply 80 by 2.

Ph.D. in Civil Engineering. Maths keeps one mentally active.Author has 52.8K answers and 33.3M answer views3y

Factors of 24 = 2x2x2x3 36 = 2x2x3x3

LCM = 2x2x2x3x3 = 72

Suppose the journey is 72 km long.

The car cover the outward journey in 72/24in 3 hours.

The return journey takes 72/36 = 2 hours.

So the average speed = (total distance covered)/(total time of travel)

= (72+72)/(3+2) = 144/5

= 28.2 km/hr. Answer.

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If a car goes 45 km per hour, what distance will it cover in 2 minutes?

Quora isn’t here to do your homework.

Just think about it for a second.

How many minutes in an hour? So it covers 45 Km in that number of minutes. So what distance will it cover in 1/30 (or 2/60 ) of that?

Hm? Jayanta Mukherjee

B Tech IEE in Instrumentation Engineering, Jadavpur University (Graduated 1990)Author has 12.4K answers and 5.4M answer views3y

स्रोत : www.quora.com

## [Solved] A car covers the first 78 km. of the journey in 90 minutes a

Given: Total Distance cover = 78 + 50 = 128 km Total time taken = 90 + 70 = 160 minutes = $$160\over 60$$ hours Formula use: Average speed = Total Home Quantitative Aptitude Speed Time and Distance Average Speed

## A car covers the first 78 km. of the journey in 90 minutes and the remaining 50 km. in 70 minutes. What is the average speed of the car?

This question was previously asked in

Kerala SET Paper 1: Held on February 2017

View all Kerala SET Papers >

50 km/hour 48 km/hour 40 km/hour 55 km/hour

## Answer (Detailed Solution Below)

Option 2 : 48 km/hour

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## Detailed Solution

Given:

Total Distance cover = 78 + 50 = 128 km

Total time taken = 90 + 70 = 160 minutes =

16060 hours

Formula use:

Average speed = Total Distance Travelled / Total Time taken

Calculation:

Average speed = 12816060 Average speed = 128160×60

Average speed = 48 km/hour

Therefore, the average speed of the car is 48 km/hour.

Hence, the correct answer is 48 km/hour.

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## More Average Speed Questions

Q1. Given below are two statements : Statement I: If a person covers a certain distance at x kmph and an equal distance at y kmph. Then, the average speed during the whole journey is

(x+y2xy)

kmph. Statement II: If the ratio of the speeds of x and y is a:b, then the ratio of the respective time taken by them to cover the same distance is b:a. In the light of the above statements, choose the correct answer from the options given below :

Q2. Avra travels from A to B at 74 km/h and returns from B to A through the same route at 111 km/h. What was his average speed during the two-way journey?Q3. A car travels from A to B at a speed of 40 km/hr, travels back from B to A at a speed of 30 km/hr and again goes from A to B at a speed of 60 km/hr. What is the average speed of the car?Q4. A train X takes 2 hours less than a train Y to cover a distance of 192 km between two cities. Their average speeds differ by 16 km/hr. How long does the faster train take to cover the journey?Q5. A transporter drives his truck for the first 4 hours of his journey at a speed of 90 km/h, and the remaining distance in 6 hours at a speed of 50 km/h. What is the average speed of the truck (in km/h)?Q6. A man travels from a point A to B at the speed of 50 km/h and then further from B to C at 75 km/h. Then, he returns from C to A at x km/h. If the ratio of the distance between A to B and B to C is 2 ∶ 3, respectively, and the average speed for the entire journey is

611149

km/h, then what is the value of x ?

Q7. A man travels from point A to B at 40 km/h, further from B to C at 50 km/h, and then further from C to D at 60 km/h. The ratio between the distances AB, BC and CD is 1 ∶ 2 ∶ 3. He returns from D to A at x km/h. If his average speed for the entire journey is

48013

km/h, then what is the value of x ?

Q8. X and Y travel a distance of 90 km each such that the speed of Y is greater than that of X. The sum of their speeds is 100 km/h and the total time taken by both is 3 hours 45 minutes. The ratio of the speed of X to that of Y is:Q9. A man covers a certain distance with a speed of

416

m/sec and comes back to the starting point with a speed of 12 km/h. Find his average speed (in km/h).

Q10. The walking speed is 10 km/hr while the speed of auto is 30 km/hr. It takes 10 hours in total to cover a journey with average speed of 18 km/hr. Find the distance covered by the auto.

## More Speed Time and Distance Questions

Q1. A boat travel 240 km downstream in 3 hours and the time is taken by the boat to travel the same distance in upstream in 6 hours. Find the speed of stream (in kmph).Q2. Given below are two statements :  Statement I : If two trains of length x km and y km are moving in the same direction at u kmph and v kmph respectively, where u > v, then time taken by faster train to cross the slower train is equal to

(x+yu+v)

hrs.  Statement II : If two trains are moving in opposite directions at u kmph and v kmph, Then, their relative speed is equal to (u + v) kmph.  In the light of the above statements, choose the correct answer from the options given below :

Q3. Given below are two statements : Statement I: If a person covers a certain distance at x kmph and an equal distance at y kmph. Then, the average speed during the whole journey is

(x+y2xy)

kmph. Statement II: If the ratio of the speeds of x and y is a:b, then the ratio of the respective time taken by them to cover the same distance is b:a. In the light of the above statements, choose the correct answer from the options given below :

स्रोत : testbook.com

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Mohammed 10 day ago

Guys, does anyone know the answer?