) ⇒ Speed = 700/35 = 20 m/sec. ⇒ Time (train takes to cross a platform) = length of train and platform/speed = (700 + 740)/20 ⇒ Time (train takes to cross a platform) = 72 seconds = 1 minute 12 seconds ∴ Train takes to cross a platform in 1 minute 12 seconds.