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An aeroplane is flying horizontally at a...

An aeroplane is flying horizontally at an altitude of 3000 ft directly over an observer.If it is flying with a speed of 300 ft/sec, the rate at which it is moving away from the observe when it is at 5000 ft away from the observer is

A

200 ft/sec

B

220 ft/sec

C

240 ft/sec

D

260 ft/sec

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The correct Answer is:
C
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