A train passes a station platform in 42 seconds and a man standing on the platform in 22 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?	Answers:	A) 299	B) 277	C) 240	D) 300	E) 112
Speed = [54 * 5/18] m/sec = 15 m/sec.   Length of the train = (15 * 22)= 
<gadget id="calculator">(15 * 22)</gadget>
<output>330</output>
330 m.   Let the length of the platform be x meters.   Then, x + 330 / 42= 15   x + 330 = 630   x = 300 m.   Answer:300
<result>D</result>
A train passes a station platform in 42 seconds and a man standing on the platform in 22 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?