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 54 km/hr. What is the length of the platform?
Pick:
A) 239 B) 240 C) 288 D) 282 E) 238
Speed = 54 * 5/18= 
<gadget id="calculator">54 * 5/18</gadget>
<output>15</output>
15 m/sec.   Length of the train= 15 * 20= 
<gadget id="calculator">15 * 20</gadget>
<output>300</output>
300 m.   Let the length of the platform be x m . Then,   (x + 300)/36= 15 =&gt; x = 240 m.   Answer: 240
<result>B</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 54 km/hr. What is the length of the platform?