Tank 1 had 1540 gallons in it and tank 2 had 236 gallons in it. water is draining out of tank 1 at a rate of 6 gallons per minute and, thus, filling tank 2 up at a rate of 6 gallons per minute. write an equation for each tank that models the volume of water in gallons, as a function of the number of minutes that the water has been flowing