A train goes from a station A to another station B at a speed of 64 km/h but returns to A at a slower speed. If its average speed for the trip is 56 km/h., the return speed of the train is nearly :
Explanation:
Let the return speed of train be y km/h. Then,
2×64×y64+y=56
⇒ y = 49.87 ≅ 50 km/h.
Hence, option (b).
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