One pump can fill a pool in 16 hr. Working with a second slower pump, the pumps together can fill the pool in 12 hr. How fast can the second pump fill the pool by itself?

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.