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Introduction to Numbers

A 120 metre...

Question

A $120$ metre long train is running at a speed of $90$ km/hr. It will cross a railway platform $230$ m long in

A

4 \frac{4}{5}

seconds

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B

9 \frac{1}{5}

seconds

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C

7

seconds

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D

14

seconds

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Solution

The correct option is D $14$ seconds
Speed $= 90 k m / h r = 90 \times \frac{5}{18} = 25 m / s e c$
Distance covered $=$ Length of train + Length of platform
$= (120 + 230) m e t r e s = 350 m e t r e s$
Time taken $= \frac{350}{25} = 14 s e c o n d s$

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