When people buy wood to burn in a stove they purchase it in units of cords (stacks that are 128 cubic feet). Camilla had 3 cords of wood delivered and stacked. She noticed that the people stacking the wood could stack 3/10 of a cord in 2/5 of an hour. (a) Find the unit rate that the water is evaporating at, in terms of inches per hour. (b) If the water evaporates at the rate in (a) for 12 hours, how many inches will evaporate? Express your answer as a mixed number. (a) What is the rate they are stacking the wood in cords per hour? (b) At the rate in (a), how many hours will it take for them to stack all 3 cords?