Explanation:

- Let the length of the bus = L meters

- Relative speed when passing first person = (Bus speed - 3) km/h

- Time taken = 10 seconds = 10/3600 hours

- So, L = (Bus speed - 3) × (10/3600) × 1000 meters

- Similarly, for the second person: Relative speed = (Bus speed - 5) km/h; Time = 11 s

- L = (Bus speed - 5) × (11/3600) × 1000 meters

- Equate both: (Bus speed - 3) × 10 = (Bus speed - 5) × 11

- Solving: 10x - 30 = 11x - 55 ? x = 25 km/h

- Option 1: 25 km/h — Correct

- Option 2: 24 km/h — Incorrect

- Option 3: 27 km/h — Incorrect

- Option 4: 28 km/h — Incorrect

Correct Answer: 25 km/h