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

240

`240sqrt(3)`

`60sqrt(3)`

None of these

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An airplane fling at constant speed parallel to the ground sqrt(3) km above. It is observe with angle of elevation 60^(0) from a point on the ground. After 5 seconds is elevation is 30^(0) then speed of aeroplane in km/hr is

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