A train 150 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 Select
A) 54 kmph B) 60 kmph C) 66 kmph D) 72 kmph E) 84 kmph

Rationale: "speed of train relative to man : 150 / 6 * 18 / 5 km / hr = 90 km / hr let speed of train = x therefore x + 6 = 90 x = 90 - 6 x = 84 km / hr answer : e"
Answer: E