alleryA train 150 m long crosses a platform 250 m long in 20 seconds. Its speed in km/h is
A60 km/h
B72 km/h
C80 km/h
D54 km/h
Answer & Solution
Correct answer: B. 72 km/h
Total distance = 150 + 250 = 400 m. Time = 20 s.
Speed = 400/20 = 20 m/s = 20 x 18/5 = 72 km/h.
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