SOLUTION: A motor cyclist drives from A to B with a uniform speed of 30 km/hr and returns back with a speed of 60 km/hr. Find its average speed.

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Question 621048: A motor cyclist drives from A to B with a uniform speed of 30 km/hr and returns back with a speed of 60 km/hr.
Find its average speed.
Answer by w_parminder(53) About Me  (Show Source):
You can put this solution on YOUR website!
Let the distance between A and B = 'D'
Time taken while traveling from A to B with a speed of 30kmph = D/30
Time taken while traveling from B to A with a speed of 60kmph = D/60
.
Average speed = (Total Distance Traveled)/(Total time taken)
Average speed = %28D%2BD%29%2F%28%28D%2F30%29%2B%28D%2F60%29%29
Average speed = %282D%29%2F%28%282D%2BD%29%2F60%29
Average speed = %282D%2A60%29%2F3D
Average speed = 40kmph