A prankster puts 4 lb of soap in a fountain that contains 200 gal of water. To clean up the mess a city crew runs clear water into the fountain at the rate of 8 gal perminute, allowing the excess solution to drain off at the same rate. How long will it be before the amount of soap in the mix-ture is reduced to 1 lb?

How much water should be evaporated from 40% vlv alcohol in order to prepare 3000 mL of 60% ( v/v) alcohol?

Mr. Goodmoore used a 60-foot sprayer to apply 11 / / 2 quarts per acre of a postemergence (burndown) herbicide to 600 acres of corn land. The herbicide is sold in a 21 / / 2-gallon container at $98.75 per container. He sprayed at a rate of 5.5 mph. Allow an extra 10 percent of total time for turning and filling. a. How many hours did it take to apply the herbicide? b. What was the cost of the herbicide?

An IV medication of 245 mL is to infuse at the rate of 40 mL/hr. What is the total infusion time? hr  min