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 9 seconds. What is the length of the fast train? Options:
A) 23 m
B) 23 (2/9)m
C) 27 (7/9)m
D) 29 m
E) 50 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 9) m =	(450/9)= 
<gadget id="calculator">(450/9)</gadget>
<output>50</output>
50	m.   50 m
<result>E</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 9 seconds. What is the length of the fast train?