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?	Choices: A) 23 m B) 23	2/9 m C) 27	7/9m D) 29 m E) 28 m
Explanation:   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.   ANSWER IS 27	7/9m
<result>C</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?