One million gallons per day of water is pumped out of the ground and is sent down the mountain in a square 1A????1 A????1 1A????1 channel to a community. Chlorine is added at the beginning of the channel to react with and disinfect (get rid of) the 50 ppm microorganisms in the water. Assume a first order reaction with a k = 0.1 min -1 . At what distance is the concentration of microorganisms equal to 1 ppm?