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An aeroplane flying horizontally , 1km ...

An aeroplane flying horizontally , 1km above the ground , is observed at an elevation of `60^@` ,after 10 seconds , its elevation is observed to be `30^@` . Find the speed of the aeroplane in km/hr.

A

240

B

`240sqrt3`

C

`60sqrt3`

D

None of these

Text Solution

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The correct Answer is:
A, B, C, D
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