Mathematics · Speed, Time and Distance

Meera is sitting exactly at the middle of a 400-meter-long train. As soon as she sees a pole from her seat, she starts walking towards the rear end of the train at a speed of 7.2 km/h. As soon as she reaches the rear end, she turns around and walks for 250 meters and stands there. Immediately after that, she realizes it is not her seat, so she moves back to her original seat. Find the distance between the pole and Meera's original seat when she finally reaches her seat, if the speed of the train is 108 km/h.