In an elevator in a tall building is at a point 180 feet above the ground . Help urgent .

In an elevator in a tall building is at a point 180 feet above the ground .The elevator moves at a rate of 12 feet per secound.

1 Represent how far above the ground the elevator is, y,after descening for x seconds

 

2 Using your equation from (part a),how long will it take the elevator to reach the ground level?

 

3 The elevator starts on the ground level,and then ascends 250 feet ,to the top floor.How long does it take the elevator to reach the top floor?(Hint: You will not use the excat same equation you did for (part a )or (part b).