Two trains A and B,186 m and 200 m long.are running at 64 km/h and 80 km/h, respectively on parallel tracks. If they are runningin the opposite directions, then how much time (in seconds) will a person sitting in the first train A take to cross the other train?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 5
When travelling in opposite directions relative speed adds i.e
Relative speed = 64 + 80 = 144km/h i.e 144 × 5/18 = 40m/s
Total distance to travel = Distance of second train = 200m
Time taken = 200/40 = 5 sec