Multiple choice What is the time taken for a 300 m. long train speeding at 60 km/hr. to cross a pole ? 5 sec. 30 sec. 50 sec. 18 sec. Reveal answer Fill a bubble to check yourself D Correct answer Explanation Train length = 300m, speed = 60 km/hr = 60 × 5/18 = 50/3 m/s. Time to cross a pole = Length/Speed = 300 ÷ (50/3) = 300 × 3/50 = 18 seconds.