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An aeroplane at an altitude of 1 km flyi...

An aeroplane at an altitude of 1 km flying horizontally at 800 km/hr passes directly over an observer. Find the rate at which it is approaching the observer when it is 1250 metres away from him.

A

120 km/hr

B

240 km/hr

C

360 km/hr

D

480 km/hr

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The correct Answer is:
D
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