It takes Frank 2 hours longer than Jane to carpet a certain type of room. Together they can carpet that type of room in 1 & 7/8 hours. How long would it take for Frank to do the job alone?

a. 1 hours c. 3 hours

b. 3 hours d. 5 hours

Can you explain how this question and the answer relate to the Unit "Rational Functions, Equations and Inequalities". What connections can I make to this unit and course material as a whole. I am a grade 12, University math student.