Question

A boy while driving to his school covers at the average speed of 15km/h.On his return trip along the same route ,covers at the average speed of 25km/h due to less traffic.What is his average speed for the whole trip

Answer 1

Answer:

20 km/h

Explanation:

The addition of the first average speed and the second divided by 2 gives the average speed used through the same route on the first and second trip.

Answer 2

Average speed = total distance / total time taken
Let the distance on one side be x
Time taken for 15km = x/15
Time taken for 25km = x/25
Total time taken = x/15 + x/25 = 8x/75
Total distance covered = 2x
Therefore average speed = 2x / 8x/75

2x * 8* /75 = 18.75 kmh





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