A $110 m$ long train travels at $30 k m / h$ . How long will it take to cross a $90 m$ long platform?

56 s

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36 s

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24 s

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45 s

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Solution

The correct option is C $24 s$
Length of the train $= 110 m$ ,length of the platform $= 90 m$
the train needs to cover $= 110 + 90 = 200 m = 0.2 k m$
Speed $= 30 k m / h$
Time $= Distance/Speed$
Time $= 0.2 / 30 = 1 / 150 h = 3600 / 150 s = 24 s$

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