Motion in a Straight Line

A paratrooper jumps from an aeroplane and opens a parachute after 2 s of free fall and starts deaccelerating with 3m∕s2. At 10 m height from ground, while descending with the help of parachute, the speed of paratrooper is 5m∕s. The initial height of the airplane is ____ m.
(g=10m∕s2)