A 270 meters long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the Length of the other train ?

A.  230 m   
B.  240 m
C.  260 m   
D.  320 m
Answer: A

Explanation:

Relative Speed    = (120 + 80)km/hr
                           = (200 x 5/18)m/sec
                           = (500 / 9)m/sec
Let the length of the other train be x meters
Then, x + 270 / 9
x + 270 = 500
x = 230.