A train passes a station platform in 36 sec and a man standing on the platform in 20 sec. If the speed of the train is 63 km/hr. What is the length of the platform?	Choose the correct choice from the following options:
A) 240 B) 288 C) 277 D) 226 E) 280
Speed = 63 * 5/18= 
<gadget id="calculator">63 * 5/18</gadget>
<output>35/2 = around 17.5</output>
17.5 m/sec.   Length of the train= 17.5 * 20= 
<gadget id="calculator">17.5 * 20</gadget>
<output>350</output>
350 m.   Let the length of the platform be x m . Then,   (x + 350)/36= 17.5 =&gt; x = 280 m.   Answer: 280
<result>E</result>
A train passes a station platform in 36 sec and a man standing on the platform in 20 sec. If the speed of the train is 63 km/hr. What is the length of the platform?