Question

A train is 180 metre long. It runs at a speed of 90 km/hr, how long will it take to pass a electric pole?

Answer 1

here distance of the pole from the train is not given
I assumed it as x
if any doubt pin me

Answer 2

90 km/hr = 90 * 5/18

                = 25 m/sec.

So the time is taken by the train to pass an electric pole = (180/25)

                                                                                               = 7.2 sec.