A 200 m long train crosses a pole in 10 seconds. Another train of length 250 m crosses a platform which is 200 m long in 15 seconds. If both trains move in opposite directions, how much time (in seconds) will they to cross each other completely?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 9.
Speed of 1st train = = 20 m/sec
Speed of 2nd train = = 30 m/sec
Relative speed = 20 + 30 = 50 m/sec
Total length = 200 + 250 = 450 m
Time = = 9 sec