Related Rates Help please!! 1. The problem statement, all variables and given/known data Two cars start moving from teh same point. One travels south at 60 mi/h and the other travels west at 25 mi/h. At what rate is the distance between the cars increasing two hours later?" 2. Relevant equations So far I have the equation.. (z^2) = (x^2) + (y^2) I know dy/dt = 60 mi/h and dx/dt = 25 mi/h. 3. The attempt at a solution I implicity differentiated the first equation and ended up with: dz/dt = (50x +120y)*(1/2z) Since I do not know what x or y is I am unable to find the rate the distance between the two cars is increasing. Thank you so much for your help!