81. A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?

By /
[A]. 320 m
[B]. 350 m
[C]. 650 m
[D]. Data inadequate
✅ The correct answer is option B.
Speed =

300

m/sec =
50
m/sec.

18
3

Let the length of the platform be x metres.

Then,

x + 300

=
50

39
3

3(x + 300) = 1950
x = 350 m.

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