1.  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?
A. 23 m
B. 23.22 m
C. 27.77 m
D. 29 m

Answer: Option C

Explanation:

Relative speed = (40 - 20) km/hr

= ( 20 x 5 ( m/sec = ( 50 ( m/sec.
18 9

ThereforeLength of faster train

= ( 50 x 5 ( m = 250 m = 27 7 m.
9 9 9