The transport of a substance across a capillary wall in lung physiology has been modeled by the differential equation dh/dt = – R/V (h/ k + h) where is the hormone concentration in the bloodstream, is time, R is the maximum transport rate, V is the volume of the capillary, and is a positive constant that measures the affinity between the hormones and the enzymes that assist the process. Solve this differential equation to find a relationship between h and t.