How do you find horizantal motion and and how long an object is in motion

A shell is fired from the ground with an initial speed of 1660 m/s at an initial angle of 52° to the horizontal.

(a) Neglecting air resistance, find the shell's horizontal range.

(b) Find the amount of time the shell is in motion.

a) Range = Vi^2(sin 2l) /g, = 272,831.3 metres.
b) Time = 2((sinL*Vi)/g), = 266.96 secs.