Homework Help: Calculus

Posted by Alex on Monday, November 8, 2010 at 1:34pm.

a police helicopter is flying at 200 km/hr at a constant altitude of 1 km above a straight road. The pilot uses radar to determine that an oncoming car is at a distance of exactly 2 km from the helicopter, and that this distance is decreasing at 250 km/hr. Find the speed of the car.

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