Commercial airliners fly at an altitude of about 10 km. They start descending toward the airport when they are far away, so that they will not have to dive at a steep angle. a) If the pilot wants the plane’s path to make an angle of 3º with the ground, at what horizontal distance must she start descending? b) If the pilot starts descending a ground distance of 300 km from the airport, what angle will the plane’s path make with the horizontal.