I need help on how to solve this one.

A sky diver jumped from an airplane and fell freely for several seconds before releasing her parachute. Her height, h, in meters about the ground at any time given by: h= -4.9tē + 5000 before she released her parachute, and, h= -4t + 4000 after she released the parachute.

How long after jumping did she release her parachute?

How high was she above the ground at that time?