A train 150m 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? Select:
A) 75kmph B) 85kmph C) 95kmph D) 105kmph E) 115kmph
Let the speed of the train be x kmph   Speed of the train relative to man = x+5 = (x+5)*5/18 m/sec   150/[(x+5)*5/18] = 6   30(x+5) = 2700   x = 85kmph   Answer is 85kmph
<result>B</result>
A train 150m 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?