Find the Average Speed for the Whole Journey

A man completed 30 km of a journey at 6 km/h and the remaining 40 km of the journey in 5 hours. Find the average speed for the whole journey

  1. 70/11 km/h
  2. 7 km/h
  3. 155/2 km/h
  4. 8 km/h
vijay Professor Asked on 6th August 2015 in Maths.
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1 Answer(s)

Answer: (2) 7 km / hr.
Explanation:-
A man completed 30 km of a journey at 6 km/h.
Then, time taken by a man to complete 30 km = 30 / 6
= 5 hr.

The remaining 40 km of the journey in 5 hours.
Then, time taken by a man to complete 40 km = 5 hr.

Formula-
Average speed of a man = Total distance covered by a man / Total time taken by a man to cover the total distance.

Then, The average speed of a man = (30 + 40) /(5 + 5)
= 70 / 10
= 7 km / hr

Then, the average speed of a man is 7 km / hr.
Hence, the answer is (2) 7 km/hr.

Anurag Mishra Professor Answered on 6th August 2015.
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