A train normally travels at a uniform speed of 72 km/h on a long stretch of straight,

Question:

A train normally travels at a uniform speed of 72 km/h on a long stretch of straight, level track. On a particular day, the train must make a 2.0-min stop at a station along this track. If the train decelerates at a uniform rate of 1.0 m/s2 and, after the stop, accelerates at a rate of 0.50 m/s2, how much time is lost because of stop-ping at the station?