Q95. Speed of a train = 72 km/h. It crosses a platform in 25 seconds. The train crosses an athlete running at 18 km/h in the same…

Question

Q95. Speed of a train = 72 km/h. It crosses a platform in 25 seconds. The train crosses an athlete running at 18 km/h in the same direction in 10 seconds. Find the length of the platform (in metres).

1. A. 150
2. B. 400
3. C. 450
4. D. 350 (Correct answer)
5. E. 500

Correct Answer

Option D — 350

Detailed Solution & Explanation

The correct answer is 350.

Key Points

• Train speed = 20 m/s. Relative speed vs athlete = (72–18) km/h = 15 m/s. Train length = 15×10 = 150 m. Train + platform = 20×25 = 500 m. Platform = 500–150 = 350 m.