How much time does a train 100 metres long running at 72 km/hr take to pass a pole?	Choose the correct choice from the following answers:  A) 7.9s  B) 2.5s  C) 5s  D) 7.6s  E) 7.4s
Explanation:   72 km/hr = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 m/s   Speed= distance/time; v = d/t   20 = 100/t   t = 5s   ANSWER: 5s
<result>C</result>
How much time does a train 100 metres long running at 72 km/hr take to pass a pole?