How long will it take him to reach the top of the 6.0 m high chimney?

santa starts to slide down the chimney, and almost too late realizes there is a fire in the fireplace. he shoots up in the air (by laying a finger aside of his nose and giving a nod) with an initial velocity of 12m/sec. how long will it take him to reach the top of the 6.0 m high chimney?