A train passes a station platform in 36 seconds and a man standing on the platform in 21 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?	Pick one.
A) 225	B) 240	C) 288	D) 267	E) 211
Speed = (54 * 5/18) m/sec = 15 m/sec. Length of the train = (15 x 21)m = 315 m. Let the length of the platform be x meters. Then, (x + 315)/36 = 15 ==&gt; x + 315 = 540 ==&gt; x = 225 m.225nswer: 225
<result>A</result>
A train passes a station platform in 36 seconds and a man standing on the platform in 21 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?