A bullet train 150 m long is running with a speed of 30 kmph. In what time will it pass a man who is running at 6 kmph in the direction opposite to that in which the bullet train is going?  Pick one:
A) 23 sec	B) 15 sec	C) 12 sec	D) 11 sec	E) 15 sec

Rationale: e 15 sec speed of the bullet train relative to man = ( 30 + 6 ) kmph = 36 * 5 / 18 m / sec = 30 / 3 m / sec . time taken by the bullet train to cross the man = time taken by it to cover 150 m at ( 30 / 3 ) m / sec = ( 150 * 3 / 30 ) sec = 15 sec
Answer: E