Question
An aircraft is flying horizontally at a constant height of 4000 ft. above a fixed observation point P (see diagram). At a certain instant the
An aircraft is flying horizontally at a constant height of 4000 ft. above a fixed observation point P (see diagram). At a certain instant the angle of elevation 
is 30 degrees and decreasing, and the speed of the aircraft is 300 mi/hr.
a) How fast is 
decreasing at this instant?
b) How fast is the distance between the aircraft and the observation point changing at this instant?
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Accounting
Authors: Jonathan E. Duchac, James M. Reeve, Carl S. Warren
23rd Edition
978-0324662962
