In Exercise, solve the given problem.An airplane flies over an observer with a velocity of...

In Exercise, solve the given problem.

An airplane flies over an observer with a velocity of 400 mi/h and at an altitude of 2640 ft. If the plane flies horizontally in a straight line, find the rate at which the distance x from the observer to the plane is changing 0.600 min after the plane passes over the observer. See Fig. 1.

Fig. 1