Question
A train travels from Station A to Station B at a speed
of 60 km/h and returns from Station B to Station A at a speed of 40 km/h. Find the average speed for the entire journey.Solution
Let the distance between A and B be D km. Time taken to travel from A to B = D / 60 hours. Time taken to travel from B to A = D / 40 hours. Average speed = 2 Ă— (Speed1 Ă— Speed2) / (Speed1 + Speed2)Â = 2 Ă— (60 Ă— 40) / (60 + 40)Â = 4800 / 100 = 48 km/h. Correct option: a
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