A plane, diving with a constant speed at an angle of 53 degree with the vertical, releases a projectile at an?

A plane, diving with a constant speed at an angle of 53 degree with the vertical, releases a projectile at an altitude of 730 m. The projectile hits the ground 5 s after release. a) What is the speed of the plane? b) How far does the projectile travel horizontally during its flight? c) What are the horizontal component of its velocity just before striking the ground?