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 18 km/hr. What is the length of the platform?  Answers
A) 80	B) 240	C) 288	D) 277	E) 221
Speed = 18 * 5/18= 
<gadget id="calculator">18 * 5/18</gadget>
<output>5</output>
5 m/sec.   Length of the train=5 * 20= 
<gadget id="calculator">5 * 20</gadget>
<output>100</output>
100 m.   Let the length of the platform be x m . Then,   (x + 100)/36= 5 =&gt; x = 80 m.   80nswer: 80
<result>A</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 18 km/hr. What is the length of the platform?