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Maths-

General

Easy

Question

An aeroplane flying horizontally 1km above the ground is observed at an elevation of 60°. After 10sec the elevation is observed to be 30° then the uniform speed per hour of the aeroplane is

$235 \sqrt{5}$ km
$235 \sqrt{3}$ km
$240 \sqrt{3}$ km
$240 \sqrt{2}$ km

The correct answer is: $240 square root of 3 text end text$ km

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