In Exercises 7–12, use the following information. The metric system is based on three di...

In Exercises 7–12, use the following information. The metric system is based on three different units:

• the gram (1 gram = 0.0022046 pound)

• the meter (1 meter = 39.37 inches)

• the liter (1 liter = 61.025 cubic inches)

Other units are formed by adding the following prefixes to these basic units:

• kilo-, which means one thousand (for example, 1 kilometer = 1,000 meters)

• centi-, which means one hundredth (for example, 1 centimeter = 1/100 meter)

• milli-, which means one thousandth (for example, 1 millimeter = 1/1,000 meter)

a. Use dimensional analysis to convert 60 miles per hour into feet per second.

b. Leadfoot Larry speeds through an intersection at 60 miles per hour, and he is ticketed for speeding and reckless driving. He pleads guilty to speeding but not guilty to reckless driving, telling the judge that at that speed, he would have plenty of time to react to any cross traffic. The intersection is 80 feet wide. How long would it take Larry to cross the intersection? (Round off to the nearest tenth of a second.)