Speed = distance/time ⇒ Speed of train = {(length of platform + length of train)/time taken by train to cross platform} = (900 + 600)/300 = 5 m/sec. ⇒ Time = distance /speed = length of train / Speed of train = 600/5 ⇒ Time = 120 seconds ⇒ Time = 120/60 = 2 minutes ∴ Train crosses a stationary pole in 2 minutes.