(A) 50 m
(B) 150 m
(C) 200 m
(D) Data inadequate
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(A) 50 m
(B) 150 m
(C) 200 m
(D) Data inadequate
Answer: Option (B) 150 m
Explanation:
Let the length of the train be x metres and its speed by y m/sec.
Then, x/y = 15 => y = x/15 .
Therefore (x + 100)/25 = x/15
=> 15(x + 100) = 25x
=> 15x + 1500 = 25x
=> 1500 = 10x
=> x = 150 m.