The formula rt = d is used to calculate distance if you know the rate and time. what is the equation for finding the time when given the rate and distance?

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.