A car's cooling system has a capacity of 20 quarts. Initially, the system contains a mixture of 5 quarts of antifreeze and 15 quarts of water. Water runs into the system at the rate of 1 gal min , then the homogeneous mixture runs out at the same rate. In quarts, how much antifreeze is in the system at the end of 5 minutes? (Round your answer to two decimal places.) qt