A high-performance jet plane, practicing radar avoidance maneuvers, is in horizontal flight of h = 35 m above the level ground. Suddenly, the plane encounters terrain that slopes gently upward at 4.3°, an amount difficult to detect (see Figure 2-22). How much time does the pilot have to make a correction to avoid flying into the ground? The speed of the plane is 750 km/h.

So looking at my triangle. 4.3 degrees for the hill.. line z is the hill and line x is the distance from the plane to the hill. Ok right? so to solve for line x i take the

tan(4.3 degrees) = (opp/adjacent)

so that is

tan(4.3deg)= x/35m

and then to solve for x u multiply the 35m and u get:

x= tan4.3deg * 35m = 2.631meters. and right here i know i am wrong cause i know the answer for x is 465.4 meters..