A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?

[A]. 120 m

[B]. 240 m

[C]. 300 m

[D]. None of these

✅ The correct answer is option B.
Speed =

54 x
5
m/sec = 15 m/sec.

Length of the train = (15 x 20)m = 300 m.
Let the length of the platform be x metres.

Then,
x + 300
= 15

x + 300 = 540
x = 240 m.

73. A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?