Im having trouble with a physics question to do with speed, and force, around a radius. The question i was given was:

"A car goes around a curved stretch of flat roadway of radius R = 100.5 m. The magnitudes of the horizontal and vertical components of force the car exerts on a securely seated passenger are, respectively, X = 210.0 N and Y = 515.0 N"

And then to work out the speed of the car. Any ideas? What formulae would i use?