Solve the Problem $720 \mathrm {~m} / \mathrm { sec }$

Multiple Choice

Solve the problem. Unless stated otherwise, assume that the projectile flight is ideal, that the launch angle is measured from the horizontal, and that the projectile is launched from the origin over a horizontal surface
-A projectile is fired at a speed of $720 \mathrm {~m} / \mathrm { sec }$ at an angle of $45 ^ { \circ }$ . How long will it take to get $18 \mathrm {~km}$ downrange? Round your answer to the nearest whole number.

A) 33 sec
B) 35 sec
C) 37 sec
D) It will never get that far downrange.