Multiple choice A 100 m long train crosses a pole in 10 seconds. What is the speed of the train? 18 km/hr 27 km/hr 36 km/hr 45 km/hr Reveal answer Fill a bubble to check yourself C Correct answer Explanation Speed = Distance/Time. The train length is 100m and it crosses a pole in 10 seconds, so speed = 100/10 = 10 m/s. Convert to km/hr: 10 × 18/5 = 36 km/hr.