Elevator

There is one single cable supporting an unoccupied construction elevator. The cable breaks when the elevator is at rest at the top of a 120 meter high building.
(a) With what speed does the elevator strike the ground?
(b) For how long was it falling?
(c) What was its speed when it passed the halfway point on the way down?
(d) For how long was it falling when it passed the halfway point?