A man covers a certain distance by scooter at 64 km/h and he returns to the starting place riding a bicycle at 16 km/h. Find the average speed for the whole journey.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 25.6 km/h.
Formula used:
The average speed = 2xy/(x + y)
Where x = the speed of a scooter to cover a certain distance = 64 km/h
y = the speed of a bicycle to return the same distance = 16 km/h
The average speed = 2 × 64 × 16/(64 + 16) = 64 × 4 /10 = 25.6 km/h