A train 300m long takes 9 sec to cross a man walking at 3kmph in a direction opposite to that of the train. Find the speed of the train?	Choose the most appropriate option.
A) 100 kmph	B) 90 kmph	C) 120 kmph	D) 117 kmph	E) 125 kmph

Rationale: "let the speed of the train be x kmph speed of the train relative to man = x + 3 = ( x + 3 ) * 5 / 18 m / sec 300 / [ ( x + 3 ) * 5 / 18 ] = 9 9 ( x + 3 ) = 1080 x = 117 kmph answer is d"
Answer: D