An aircraft flying at 550 feet over level terrain drops a supply package. (a) How long does

Question:

An aircraft flying at 550 feet over level terrain drops a supply package.
(a) How long does it take the supply package to strike the ground?
(b) The aircraft is flying at 138 miles per hour. How far does the supply package travel horizontally during its descent?
Use the position equation given in Example 8 as the model for the problem.