From a point on the ground, the angle of elevation of an aeroplane flying at an altitude of \( 5... VIDEO
From a point on the ground, the angle of elevation of an aeroplane flying at an altitude of \( 500 \mathrm{~m} \) changes from \( 45^{\circ} \) to \( 30^{\circ} \) in 5 seconds. Find the speed of the aeroplane (in \( \mathrm{kmph} \) ).
(a) \( 720(\sqrt{3}-1) \)
(b) \( 720(\sqrt{3}+1) \)
(c) \( 360(\sqrt{3}-1) \)
(d) \( 360(\sqrt{3}+1) \)
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