The angle of elevation of an airplane from a point on the ground is \( 60^{\circ} \). After a fl...

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The angle of elevation of an airplane from a point on the ground is \( 60^{\circ} \). After a flight of 30 seconds the angle of elevation becomes \( 30^{\circ} \). If the airplane is flying at a constant height of \( 3000 \sqrt{3} \mathrm{~m} \), then the speed of the airplane is
a. \( 200 \mathrm{~km} / \mathrm{hr} \)
b. \( 600 \mathrm{~km} / \mathrm{hr} \)
c. \( 680 \mathrm{~km} / \mathrm{hr} \)
d. \( 720 \mathrm{~km} / \mathrm{hr} \)
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