Question:A train passes over a bridge of length 200 m in 40 seconds.If the speed of the train is 81 km per hour, its length is : 

A 900 m 
B 1800 m 
C 700 m 
D 600 m 

+ Answer
C 

+ Explanation
Speed of the train

`= (81 xx 5/18)` m∕sec.

`= 45/2` m∕sec

Let the length of the train be x metres.

`(x + 200)/40`

`= 45/2 => 2x + 400`

`= 1800 => x = 700 m.`

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Irin Moni

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