The speed s of blood that is r centimeters from the center of an artery is given below, where c is a constant, r is the radius of the artery, and s is measured in centimeters per second. suppose a drug is administered and the artery begins to dilate at a rate of dr/dt. at a constant distance r, find the rate at which s changes with respect to t for c = 1.54 105, r = 1.3 10-2, and dr/dt = 1.0 10-5.

s = c(r^2 − r^2)

ds/dt =/s