What is the Average Speed of the Car? If

A car travels a distance of 75 km 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?

  1. 40 km/h
  2. 25 km/h
  3. 15 km/h
  4. 12.5 km/h
vijay Professor Asked on 6th August 2015 in Maths.
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1 Answer(s)

Answer: (3)   15 km/hr
Explanation:-
A car travels a distance of 75 km at the speed of 25 km/h.
Then, time taken by the car to cover the distance 75 km = 75/25
=  3 hr.

It covers the next 25 km of its journey at the speed of 5 km/h.
Then, time taken by the car to cover the distance 25 km = 25/5
= 5 hr

And the last 50 km of its journey at the speed of 25 km/h.
Then,  time taken by the car to cover the distance 50 km = 50 / 25
= 2 hr.

Formula-
The average speed of the car = Total distance / total time taken by car to cover the total distance.

Then, the average speed of the car = (75 + 25 + 50) / (3 + 5 + 2)
= 150 / 10
= 15 km / hr
Then, the average speed of the car is 15 km/hr.

Hence, the answer is (3) 15 km/hr.

Anurag Mishra Professor Answered on 6th August 2015.
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