Question:Two trains are running at 40 km∕hr and 20 km∕hr respectively in the same direction.Fast train completely passes a man sitting in the slow train in 5 seconds.What is the length of the fast train ? 

A `23 2/9 m` 
B 27 m 
C `27 7/9 m` 
D 23 m 

+ Answer
C 

+ Explanation
Relative speed` = (40 - 20)` = 20  km∕hr

                     `= (20 xx 5/18)` m∕sec.

Length of the train` = (20 xx 5/18 xx 5) m`

        `= 27 7/9 m.`

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Irin Moni

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