arithmetic - a train crosses a platform 100 m long in 60 seconds at a speed of 45 kmhr the time taken by the train to cross an electric pole is - skillgun

Speed = [45 * 5/18] m/sec = [25/2] m/sec.
Let the length of the train be x metres.
Then, x + 100 / [25/2] = 60 or x = 650 m
? time taken by the trian to cross an electric pole
= [650 * 2/25] sec =52 sec.