A 110 m long train takes 3 seconds to pass a pole. How long is the platform if the train passes it in 15 seconds?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 440 m
To pass a pole, a train covers its own length; to pass a platform, it covers its own length plus the platform’s length.
Speed \(\displaystyle =\frac{110}{3}\) m/s (110 m in 3 seconds)
Distance covered in 15 seconds \(\displaystyle =\frac{110}{3}\times15=550\) m
Platform \(=550-110=440\) m
Shortcut: The train covers its own length in 3 seconds, so in 15 seconds it covers 5 lengths. The platform is the extra 4 lengths: \(4\times110=440\) m.