bmohankumar
Answered

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 slower train in 5 seconds. What is the length of the fast train?

Answer :

Relative speed = (40 - 20) km/hr =(20 x5/18) m/sec =(50/9) m/sec
Therefore Length of faster train =(50/9 x 5) m = 250/9 m = 27 7/9m.
manitkapoor2
the relative speed of fast train w.r.t to slow train is 40-20=20 km/hr
it crosses the man completely in 5 seconds therefore
it travels its length in 5s
so it length is 20(5)/60=20/12=1.667 km

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