Question:A train passes a 50 m long platform in 14 seconds in 14 seconds and a man standing on the platform in 10 seconds.The speed of the train in km∕hr is : 

A 24 
B 36 
C 40 
D 45 

+ Answer
D 

+ Explanation
Let the length of train be x metres.Then

`x/10 = (50 + x)/14 => 14x`

`= 500 + 10x => x = 125.`

:. Speed` = (125/10)` m∕sec.

          `= (125/10 xx 18/5)` km∕hr

        `= 45` km∕hr.

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Irin Moni

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