A household refrigerator that has a power input of 80W (assume constant work input over time) and a coefficient of performance of 2.5 is to cool 24 bottles of Mt. Dew weighing 1 lb ea to 40 °F. If the bottles are initially at 75 °F, determine how long it will take for the refrigerator to cool them. Assume the cans can be treated as a pure substance whose specific heat is .42 Btu/lb °F.