An aeroplane is flying horizontally at a height of km with a velocity of 15 km/hr. The rate at which it is receding from a fixed point on the ground which is passed over 2 minutes ago.

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9 km/hr

3 km/hr

6 km/hr

10 km/hr

answer is A.

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Detailed Solution

l2=x2+h22ldldt=0+2xdxdtdldt=xldxdt=65×15=9km/hrx=12h=23l2=14+49=2556l=5/6

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