Question

Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:
A.9
B.9.6
C. 10
D.10.8

Answer 1

Answer: 10.8

Explanation:

Relative speed = (60 + 40) km/hr =  100 x 5 m/sec =  250 m/sec.

18 9

Distance covered in crossing each other = (140 + 160) m = 300 m.

Required time =  300 x 9 sec = 54 sec = 10.8 sec.

250 5