Correct Answer: Option B
Let the length of the train be x metres and its speed by y m/sec.
Then, x/y = 15
=> y = x/15
So, (x + 100)/25 = x/15
=> 15(x + 100) = 25x
=> 15x + 1500 = 25x
=> 1500 = 10x
=> x = 150 m.
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