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An aeroplane flying horiontally 1 km abo...

An aeroplane flying horiontally 1 km above the ground is observed at an elevation of `60^@` and after 10 seconds the elevation is observed to be `30^@`. The uniform speed of the aeroplane in km/h is

A

240

B

`240sqrt3`

C

`60sqrt3`

D

None of these

Text Solution

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The correct Answer is:
B
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