In 2012, James Cameron descended to the bottom of Challenger Deep in the Marianas Trench; the deepest point in the ocean. The vessel he rode in was called DeepSea Challenger. Challenger Deep is 35,814 feet deep at its lowest point

a) DeepSea Challenger’s descent was a change in depth of (-4) feet per second. We can use the equation y=-4x to model this relationship, where y is the depth and x is the time in seconds that have passed. How many seconds does this model suggest it would take for DeepSea Challenger to reach the bottom?

b)To end the mission DeepSea Challenger made a one-hour ascent to the surface. How many seconds is this?