Does anyone know how to solve this physics problem?

Collision - The engineer of a pager train traveling at 20 m/s sights a freight train whose caboose is 200 m ahead on the same track. The freight train is traveling at 15 m/s in the same direction as the panger train. The engineer of the pager train immediately applies the brakes, causing a constant acceleration of -0.1 m/s^2, while the freight train continues with constant speed. Take x=0 as the location of the front of the pager train when the engineer applies the brakes. (a) Will the cows nearby witness a collision? (b) If so, where will it take place?