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Velocity

A 75 meter lo...

Question

A 75 meter long train is moving at 20 kmph. It will cross a man standing on the platform is :

A

12 seconds

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B

14 seconds

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C

13.5 seconds

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D

15.5 seconds

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Solution

The correct option is C 13.5 seconds
Length of the train $= 75 m e t e r$
Speed of the train $= 20 k m p h = 20 \times \frac{5}{18} = 5.55 m / s e c$
So,
Time to cross a man on the platform $= \frac{75}{5.55}$
$= 13.5 s e c o n d s$

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