Posted by **matthew** on Friday, December 16, 2011 at 6:17am.

(Airplane & Radar) An airplane is flying (horizontally) at the height of 6 km on a flight path that will take it

directly over a radar tracking station (on ground). If the distance D between the plane and the radar is

decreasing at a rate of 300 km/hr, find the speed of the plane when D remains 10 km.

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