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May have runways shorter than do airports at sea level.

have same length of runways as do airports at sea level.

have shorter runways than do airports at sea level.

have longer runways than do airports at sea level.

answer is A.

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Detailed Solution

Lift on airport wings is proportional to $ρ v^{2}$ where $ρ$ = Density of air and v = speed. At high altitude $ρ$ is less, hence v be more. Hence, longer runways are required.

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