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If the car speeds up at a steady 1.2 m/s^2, how long after starting is the magnitude of its centripetal acceleration equal to the tangential acceleration?

it seems simple, but i just cant seem to get it!...

find: change in time when centripetal acceleration = tangential acceleration.

r = 115 m.

a = 1.2 m/s^2 (which type of a, i dont know)

centripetal accel = v^2/r or w^2/r

tangential accel = (radius)(angular accel)

i tried setting them equal to each other obviously, but no luck. can someone help me out!?!?