Question

57. Two trains each of length 100 m moving parallel
towards each other at speed 72 km/h and
36 km/h respectively. In how much time will they
cross each other?
(1) 4.5 s
(2) 6.67 s
(3) 3.5 s
(4) 7.25 s​

Answer 1

Answer:

6.67 s

Explanation:

Relative velocity = 72 + 36 = 108 km/h = 108 * 5/18 m/s = 30 m/s

Distance to cover = 100 + 100 = 200 m

Time required to cross = 200/30 = 6.67 s