A non-stop bus goes from one station to another station with a speed of 54 km h-1. the same bus returns from the second station to the first station with a speed of 36 km h-1. find the average speed of the bus for the entire journey.
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Average speed = (2*S1*S2) / (S1+S2) = 2*54*36/(54+36) = 3888/90 = 43.2 kmph
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