In the figure below, a highway rest area (at D) and radar stations (at A and B) lie on a level east-west line, A is 9,000 feet due west of D. An airplane (at C) is shown directly above the rest area, flying due west at a constant speed of 300 feet per secod and at a constant altitude of 12,000 feet. The airplane is located at a straight-line distance of 15,000 feet from the radar station at A and 13,000 feet from the radar station at B.

Which of the following values is closest to the number of seconds it will take for the airplane to fly from C to the point directly above the radar station at A?

Options

A. 17
B. 30
C. 40
D. 43

Answer

B