Two trains A and B of lengths 190 m and 195 m are running at speeds of 56 km/h and 76 km/h, respectively, towards each other on parallel tracks. In how much time will they cross each other?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 10.5 seconds.
The length of the train A = 190 m
The length of the train B = 195 m
The speed of the train A (x) = 56 km/h
The speed of the train B (y) = 76 km/h
The relative speed of the trains when they cross opposite to each other = (x + y) km/h
As we know that
The relative speed = x + y = 56 + 76 = 132 km/h
⇒ 132 × 5/18 = (660/18) m/s
Now, the time taken can be calculated as:
⇒ (190 + 195)/(660/18) = (385 × 18)/660 = 10.5 sec