A train 200m 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?  Choose the correct choice:  A) 85kmph  B) 115kmph  C) 105kmph  D) 95kmph  E) 125kmph
Let the speed of the train be x kmph   Speed of the train relative to man = x+5 = (x+5)*5/18 m/sec   200/[(x+5)*5/18] = 6   30(x+5) = 3600   x = 115kmph   Answer is 115kmph
<result>B</result>
A train 200m 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?