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Question

A train is running at a speed of40km/hr and it crosses a post in18seconds. What is the length of the train?


A

190metres

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B

160metres

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C

200metres

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D

120metres

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Solution

The correct option is C

200metres


Step 1

Speed of a train

v=40km/hrv=40000/3600m/sv=400/36m/s

Step 2

Time taken to cross,t=18seconds

Distance covered,d=vt

d=(400/36)x18

On calculating further, we get,

d=400/2d=200m

Therefore, the length of the train is 200m


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