When Maggie applies the brakes of her car, the car slows uniformly from 15.9 m/s to 0 m/s in 2.47 s

When Maggie applies the brakes of her car, the car slows uniformly from 15.9 m/s to 0
m/s in 2.47 s. How far ahead of a stop sign must she apply her brakes in order to stop at the sign?