# The new angle of inclination

It is a common experience to hear the sound of a low flying airplane, and look at the wrong place in the sky to see the plane. Suppose that a plane is traveling directly toward you at a speed of 200 mph and an altitude of 3,000 feet, and you hear the sound at what seems to be an angle of inclination of 20 degrees.

At what angle should you actually look in order to see the plane? Assume the speed of sound is 1,100 ft/sec

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The new angle of inclination is determined.

$2.19