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Mathematics - Calculus - Rate measures

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A plane flying at an altitude of 25,000 ft. has a defective airspeed indicator. To determine her speed, the pilot sights a fixed point on the ground. At the moment when the angle of depression (From the horziontal) of her line of sight is 65 degrees, she notes that this angle is increasing at 1.5 degrees per second. What is the speed of the plane?

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The expert determines rate measures for calculus. A complete, neat and step-by-step solution is provided.

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Let at instant t, the distance between the position of the plane and point vertically above the fixed point on the ...

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