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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.

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The correct Answer is:
`240sqrt(3)km//h`
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ML KHANNA-HEIGHTS AND DISTANCES-Problem Set (1) FILL IN THE BLANKS
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