A bullet train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the bullet train is 54 km/hr, what is the length of the platform?  Choose the correct option.
A) 240 m	B) 220 m	C) 260 m	D) 224 m	E) 239 m
A   240 M   Speed = 54 x 5/18 = 15 m/s   Length of the bullet train = (15 x 20)m = 300 m.   Let the length of the platform be x metres.   Then, (x + 300)/36 = 15   --&gt; x + 300 = 540   x = 240m.
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A bullet train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the bullet train is 54 km/hr, what is the length of the platform?