While Liam and Noah are fishing 1 mile from shore, their boat springs a leak, and water comes in at a constant rate of 12 gallons per minute. The boat will sink if it takes in more than 40 gallons of water. Liam starts rowing towards the shore at a constant rate of 3 miles per hour while Noah bails water out of the boat. What is the slowest rate, in gallons per minute, at which Noah can bail if they are to reach the shore without sinking?