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A train 110 m long travels at 60 km/hr. How long does it take to cross a platform 240 metres long?

21 sec
20 sec
18 sec
24 sec

Correct Answer: 21 sec

Explanation:

Distance covered = 110 + 240 = 350 m
Speed = 60 km/ph = 60 x (5/18) m/s = 50/3 m/sec.
Time = distance / speed = 350 x 3 / 50 = 21 sec.

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