Two trains travel in opposite directions at 36 kmph and 45 kmph and a man sitting in slower train passes the faster train in 4 seconds. The length of the faster train is
Choose the correct choice from the following answers.
A) 80 m B) 100 m C) 90 m D) 180 m E) None
Solution   Relative Speed	= (36 + 45) km/hr   = (81 x 5/18) m/sec   = (45/2) m/sec   Length of the train	= (45 / 2 x 4) m   = 90 m.   Answer 90 m
<result>C</result>
Two trains travel in opposite directions at 36 kmph and 45 kmph and a man sitting in slower train passes the faster train in 4 seconds. The length of the faster train is