Exercise 1: How fast is 60 miles/hour in kilometers/hour? in meters/second?
Exercise 2: My car gets 25 miles /gallon, and my daily commute is 10 miles round trip. How much fuel do I use each day? Is it more or less than a gallon?
Exercise 1: Convert the water consumed for public supply to liters per day. Hint: 1 Billion = 1,000,000,000 = 109, and 1 gallon = about 4 liters.
Exercise 2: A bathtub holds about 15 gallons of water, and there are 300 Million (300,000,000) people in the United States. How many liters would it take for everyone to take a bath?
Exercise 3: Divide your answer to exercise 2 by your answer to exercise 1. What fraction of public supply is used for baths?
Exercise 4: If we all saved water, we could reduce American household consumption by 100 gallons/person/day. Convert that to liters/person/year.
Exercise 5: People in sub-saharan Africa use about 25,000 liters/person/year. How many Africans could be supported by the water one American wastes?