A train 120 m long passes a man,running at 6 kmph in the direction opposite to that of the train,in 6 seconds.The speed of the train is	Choose the correct choice from the following answers:
A) 54 kmph  B) 60 kmph  C) 66 kmph  D) 72 kmph  E) 82 kmph

Rationale: "speed of train relative to man : 120 / 6 * 18 / 5 km / hr = 72 km / hr let speed of train = x therefore x + 6 = 72 x = 72 - 6 x = 66 km / hr answer : c"
Answer: C