74. A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:

By /
[A]. 50 m
[B]. 150 m
[C]. 200 m
[D]. Data inadequate
✅ The correct answer is option B.
Let the length of the train be x metres and its speed by y m/sec.

Then,
x
= 15         y =
x
.

y
15

x + 100
=
x

25
15

15(x + 100) = 25x
15x + 1500 = 25x
1500 = 10x
x = 150 m.

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