While rolling along a flat terrain at 48.0km/h, a military tank fires its main cannon at 30.0^∘ above the horizontal. The shell leaves the barrel with muzzle velocity of 480m/s relative to the moving tank. Neglect air resistance and the height of the barrel above the ground. Do not neglect the speed of the tank.

1. a. Calculate the maximum height of the shell above the ground.
2. b. How long does it take the tank to arrive at the target hit by the shell?