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An aeroplane flying horizontally 1 km ab...

An aeroplane flying horizontally 1 km above the ground is observed at an elevation of `60^(@)`. If after 10 seconds, the elevation is observed to be `30^(@)`, then the uniform speed of the aeroplane per hour is

A

120 km

B

240 km

C

`240 sqrt(3)` km

D

`240//sqrt(3)` km

Text Solution

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The correct Answer is:
C
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