Question
A person travels from town A to town B, a distance of 20 km, at 4 km/h, and then from B to C, a distance of 30 km, at 5 km/h. What is his average speed for the entire journey?
Solution
ATQ, Total distance = 20 + 30 = 50 km Time from A to B = 20/4 = 5 hours Time from B to C = 30/5 = 6 hours Total time = 5 + 6 = 11 hours Average speed = Total distance / Total time = 50 / 11 km/h
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