1. Carl and Mike start a 3 mile race at the same time. If Mike ran the race at 6 miles per hour and nishes the race 10 minutes before Carl, how fast does Carl run?
2. In order to remove water from a ooded basement, two pumps, each rated at 40 gallons per minute, are used. After half an hour, the one pump burns out, and the second pump nishes removing the water half an hour later. How many gallons of water were removed from the basement?