A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?	Select the correct option
A) 246 m	B) 240 m	C) 257 m	D) 577 m	E) 567 m
Speed = (54 * 5/18) m/sec = 15 m/sec. Length of the train   = (15 x 20)m = 300 m. Let the length of the platform be x meters. Then, (x + 300)/36   = 15 ==&gt; x + 300 = 540   ==&gt; x = 240 m.   Answer: 240 m
<result>B</result>
A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?