An aeroplane flying horizontally 1 km above the ground is observed at an elevation of 60^{0}. If after 10 secs the

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Q 3060891715.     An aeroplane flying horizontally 1 km above the ground is observed at an elevation of 60^{0}. If after 10 secs the elevation is observed to be 30^{0}. Then the uniform speed per hour the aeroplane is
A

20\sqrt{3}\ km

B

240\sqrt{3}\ km

C

256\sqrt{3}\ km

D

250\sqrt{3}\ km

HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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