An airplane glides at its best glide speed of 70 knots and covers 21 nautical miles over the ground from 3,000 feet AGL in still air. If a 20-knot headwind is present, approximately how far over the ground can it glide from 3,000 feet AGL?

After an engine failure at altitude, while maintaining best glide airspeed, under which steady wind condition will the airplane achieve the greatest glide distance over the ground?

Following a simulated engine failure at 4,000 feet AGL, you establish best glide speed toward a field 7 miles straight ahead. Which wind condition will result in the shortest glide distance over the ground to that field?

During an engine-out glide, best glide speed is used to maximize distance covered while minimum sink speed is used to minimize