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?  Choose the correct choice
A) 27 7/9m B) 27 m C) 33 m D) 23 4/9 m E) 25 m
Relative speed = (40 - 20) km/hr = ( 20 x 5/18 ) m/sec = 50/9 m/sec.   Therefore Length of faster train = ( 50/9 x 5 ) m = 250/9 m = 27 7/9 m.   27 7/9mNSWER 27 7/9m
<result>A</result>
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?