Two trains are running at 40 kmph and 20 kmph 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 trian?	Choose the correct choice from the following answers.
A) 23 m  B) 23 2/9 m  C) 27m  D) 27 7/9m  E) 29 7/9m
relative speed=20kmph=50/9m/sec   length of the train=50/9*5=250/9=27 7/9m   ANSWER:27 7/9m
<result>D</result>
Two trains are running at 40 kmph and 20 kmph 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 trian?