A train passes a man standing on the platform. If the train is 170 meters long and its speed is 72 kmph, how much time it took in doing so?	Choose the correct answer:
A) 3 1/2 sec
B) 3 5/2 sec
C) 3 7/2 sec
D) 8 1/2 sec
E) 3 1/8 sec
8 1/2 sec = 170   S = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 mps   T= 170/20 = 8 1/2 sec   Answer: 8 1/2 sec
<result>D</result>
A train passes a man standing on the platform. If the train is 170 meters long and its speed is 72 kmph, how much time it took in doing so?