Calculus, Related Rates
posted by Jason .
A particle at point A is 50 mm away from a second particle at point B. The first particle is moving toward point B at a constant rate and the second particle is moving at a right angle to the line AB at a rate that is 1/3 of the rate of the first particle. The particles get closer to each other for 3/4 of a second, and then begin to get further apart. How fast is the second particle moving in mm/sec?