A man standing on a platform finds that a train takes 3 seconds to pa…

Question

A man standing on a platform finds that a train takes 3 seconds to pass him and another train of the same length moving in the opposite direction takes 4 seconds. The time taken by the trains to pass each other will be :

Accepted Answer

Option B. 33/7 seconds. Answer & Solution Answer: Option B Solution: Let the length of each train be x meters Then, speed of first train = x3 m/sec Speed of second train = x4 m/sec ∴ Required time & = [ x + x ( x3 + x4 ) ] sec & = [ 2 x ( 7 x12 ) ] sec & = ( 2 × 127 ) sec & = 247 sec & = 33/7 sec