A train passes two men walking in its direction of travel at 3 km/h and 5 km/h in 10 seconds and 11 seconds respectively. What is the speed of the train?
Correct answer B. 25 km/h
Explanation
Train length is the same: (v − 3) × 10 = (v − 5) × 11 in consistent units. So 10v − 30 = 11v − 55, giving v = 25 km/h.
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