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A plane flying with a constant speed of 9 km/min passes over a ground radar station...

A plane flying with a constant speed of 9 km/min passes over a ground radar station at an altitude of 6 km and climbs at an angle of 25 degrees. At what rate is the distance from the plane to the radar station increasing 5 minutes later?

Hint: The law of cosines for a triangle is

c^2=(a^2)+(b^2)−2abcos⁡(θ)

where ? is the angle between the sides of length a and b

Math   Calculus   
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