(A) 320 m
(B) 350 m
(C) 650 m
(D) Data inadequate
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(A) 320 m
(B) 350 m
(C) 650 m
(D) Data inadequate
Answer: Option (B) 350 m
Explanation:
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.