A 250-meter-long train crosses a pole in 45 seconds. What is its speed?

Correct option is D

Sol. Speed = Distance / Time = 250 meters / 45 seconds = 5.56 m/s To convert to km/h: 5.56 × 18/5 = 20 km/h
Explanation of each option:
· (a) 15 km/h – Incorrect. This would require more time to cross 250 m.
· (b) 25 km/h – Incorrect. That speed would cover 250 m in less than 45 seconds.
· (c) 18 km/h – Incorrect. Slightly slower than required, doesn’t match 250 m in 45 sec.
· (d) 20 km/h – Correct. Accurately calculated from 250 m ÷ 45 sec = 5.56 m/s = 20 km/h.