In what time will a train 100 m long cross an electric pole if its speed is 144 km/hr :A2.5 secB3.2 secC6.1 secD2.9 secAnswer: A. 2.5 secRead Explanation:Speed of the train =144 kmph=144×18/5=40 m/sec Length of electric pole =100 meter Time taken to cross the electric pole = 100/40 = 2.5 secondsOpen explanation in App