Help in solving mechanics question

[RiRoRa]

So here it goes, a car is being driven along a road at a steady 25m/s when the driver suddenly notices that there is a fallen tree blocking the road 65 metres ahead.The driver immediately applies the brakes giving the car a constant retardation of 5m/s^2.How far in front of the tree does the car come to rest?If the driver had not reacted immediately and the brakes were applied one second later, with what speed would the car have hit the tree? Can i please get an explanation along with the answer.Thanks.