How far away from the dog was the train when the conductor "slammed" on the brakes? ume accel. is constant.?

A trolley in San Fransisco can come to a stop from full speed in 10.0 s. The conductor on the trolley sees a dog on the tracks and slams on the brakes. The dog, sensing that the trolley will not stop in time, jumps off the tracks before the train reaches him. The train pes the point where the dog was standing on the tracks and, with the brakes still locked, travels 4.0 more meters in a time of 2.0 s. (You will have to use 3 different formulas)