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