Multiple choice

A train moving at the speed of 80 km/hr crosses a platform in 20 seconds. What is the length of the train?

  1. 330 m

  2. 336 m

  3. 360 m

  4. Cannot be determined

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The length of the train cannot be determined from the given information. To find train length, we need either the length of the platform or the total distance covered (train length + platform length). The formula is: Distance = Speed × Time. Here, Speed = 80 km/hr = 80 × (5/18) m/s ≈ 22.22 m/s. Distance covered in 20 seconds = 22.22 × 20 ≈ 444.44 m. But this is the train length PLUS platform length. Without knowing the platform length, we cannot find the train length alone.

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