Question
A man travels 45 km from town A to town B at a speed of
15 km/h. He returns from B to A by the same route at a speed of 9 km/h. What is his average speed for the entire journey?Solution
ATQ, Distance each way = 45 km Total distance = 45 + 45 = 90 km Time from A to B = 45 / 15 = 3 hours Time from B to A = 45 / 9 = 5 hours Total time = 3 + 5 = 8 hours Average speed = Total distance / Total time = 90 / 8 = 11.25 km/h
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