Let x(t) and y(t) be distance horizontally and vertically respectively.
1) x(t) = 160t and y(t) = 2000 - 15t
2) the plane touches ground when y(t) =0
So, 2000 - 15t = 0
or 15t =2000
or t = 2000/15 = 133.33 seconds (approx)
3) The horizontal distance travelled by airplane when the plane touches the ground is
x(133.33) = 160*133.33 = 21333.32 feet (approx)