Answer:
<em>T tof = 2 ( v 0 sin θ 0 ) g . T tof = 2 ( v 0 sin θ 0 ) g . This is the time of flight for a projectile both launched and impacting on a flat horizontal surface.</em>
24
Step-by-step explanation:
3x5=15
15+9=24
20, 40, 60
x + 2x + 3x = 120
6x = 120
x = 20