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? Choose the correct answer.
A) 176 m  B) 240 m  C) 267 m  D) 602 m  E) 267 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?