A train 75m long takes 6 sec to cross a man walking at 5kmph in a direction opposite to that of the train. Find the speed of the train?  Pick one:	A) 35kmph	B) 40kmph	C) 45kmph	D) 50kmph	E) 55kmph
Let the speed of the train be x kmph   Speed of the train relative to man = x+5 = (x+5)*5/18 m/sec   75/[(x+5)*5/18] = 6   30(x+5) = 1350   x = 40kmph   Answer is 40kmph
<result>B</result>
A train 75m long takes 6 sec to cross a man walking at 5kmph in a direction opposite to that of the train. Find the speed of the train?