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A motorcyclist drives from A to B with a uniform speed of 30 km h–1 and returns back with a speed of 20 km h^–1. Find its average speed

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asked Nov 1, 2017 in Physics by jisu zahaan (28,760 points) ● 28 ● 435 ● 1074

A motorcyclist drives from A to B with a uniform speed of 30 km h–1 and returns back with a speed of 20 km h–1. Find its average speed

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+1 vote
answered Nov 1, 2017 by sforrest072 (157,439 points) ● 63 ● 448 ● 1260
selected Feb 21, 2018 by sanjeev
 
Best answer

Let AB = x, So t 1=x /30, and t2 =  x /20 

Total time = t1 + t2 = 5x / 60  h.   

Average speed for entire journeyTotal distance /Total Time  = 2x / 5x / 60= 24 km h-1

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