A train 390 metres long is moving at a speed of 25 kmph. It will cross a man coming from the opposite direction at a speed of 2 km per hour in : Choose the correct choice from the following answers:  A) 30 sec  B) 32 sec  C) 36 sec  D) 38 sec  E) 52 sec

Rationale: "relative speed = ( 25 + 2 ) km / hr = 27 km / hr = ( 27 × 5 / 18 ) m / sec = 15 / 2 m / sec . time taken by the train to pass the man = ( 390 × 2 / 15 ) sec = 52 sec answer : e"
Answer: E