Q.
A. 50 m
B. 150 m
C. 200 m
D. Data inadequate
E. None of the above
Correct choice: B
Explanation:
Let the length of the train be x metres and its speed by y m/sec.
15(x + 100) = 25x
15x + 1500 = 25x
1500 = 10x
x = 150 m.