Alexander and lan can each wash a car and vacuum its interior in 2 hours. Anjo needs 3 hours to do the same job by himself. If Anjo, Alexander, and lan work together, how long
will it take them to clean a car?

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?