1. An experienced employee can enter tax data into a computer twice as fast as a new em-
ployee. Working together, it takes the employees 2 hr. How long would it take the experi-
enced employee working alone?
2. One roofer can put a new roof on a house three times faster than another. Working to-
gether, they can roof a house in 4 days. How long would it take the faster roofer working
3. One pipe can fill a swimming pool in 6 hr,
and another pipe can do it in 9 hr. How long
will it take the two pipes working together to
fill the pool full?