A train passes a man standing on the platform. If the train is 140 meters long and its speed is 72 kmph, how much time it took in doing so?	Choose the correct choice from the following answers:  A) 6 Â½ sec  B) 6 Â½ sec  C) 9 Â½ sec  D) 7 sec  E) 7 Â½ sec
7 sec   7 sec   7 sec = 140   S = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 mps   T= 140/20= 
<gadget id="calculator">140/20</gadget>
<output>7</output>
7 sec
<result>D</result>
A train passes a man standing on the platform. If the train is 140 meters long and its speed is 72 kmph, how much time it took in doing so?