(A) 120 m
(B) 240 m
(C) 300 m
(D) None of these
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(A) 120 m
(B) 240 m
Answer: Option B
Explanation:
Speed = 54 x (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 metres.
Then, (x + 300)/36 = 15
x + 300 = 540
x = 240 m.