A. 320 m
B. 350 m
C. 380 m
D. 410 m
Speed = (300/18) m/sec = (50/3) m/sec
Let the length of the platform be x metres
Then, [ (x + 300) / 39 ] = 50/3
=> 3(x + 300) = 1950
=> x = 350 m
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