A car travels 30 kilometers at a uniform speed of 40 km/hr and next 30
km at a uniform speed of 20 km/hr. Find its average speed.
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Answer:
First 30 km uniform speed is (u1) = 40 km/h
Second 30 km uniform speed is ( u2 ) = 20 km/h
Total distance ( d ) = 30 + 30 = 60 km
Time taken in 1st time = d / t = 30/40 also, 3h / 4 = 180/4 = 45 min
Time taken in 2nd time = d/t = 30/20 also, 3h/2 = 180/2 = 90 min
Total time = 45 + 90 = 135 min = 135/60
Average speed = 60/135/60 = 60 * 60 /135 =
26.66 km/h ( answer )
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