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A non-stop bus goes from one station to another station with a speed of 54km hr-1(minus 1).

The same bus returns from the second station to the first station with a speed of 36km hr-1. find the average speed of the bus for the entire journey.


Avg. speed = 2d/(d/36 + d/54) = 2*54*36/(36 + 54) = 2*3*36/5 = 43.2 kmph.
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