A facility maintenance supervisor is estimating the labor needed to repaint an office suite. Marcus, an experienced painter, can finish the job in 7 hours alone. Sarah, a new assistant, would take $s$ hours to complete the job alone. When working together, they can finish the painting in 4 hours. Match each description of their work to the correct mathematical expression used to set up the problem.

A project manager is calculating the time needed for two employees to complete a task. If Employee A can complete the task alone in ${}8$ hours and Employee B can complete the task alone in $t$ hours, which equation correctly represents their combined work rate if they can finish the task together in ${}5$ hours?

A commercial painting contractor is estimating the time it will take for a new hire to complete a job alone. The contractor knows that they can finish the job in 6 hours alone, and that together they can finish it in 4 hours. Arrange the following steps in the correct order to solve for the new hire's individual painting time $t$.

A facility maintenance supervisor is estimating the efficiency of a painting crew for a commercial renovation. If a professional painter requires $t$ hours to paint a suite of offices alone, the algebraic expression representing the portion of the suite they complete in exactly one hour is ____.

A facilities management team is calculating the time needed to paint a newly renovated conference room. If a senior painter can finish the room alone in 6 hours and an apprentice can finish it alone in $t$ hours, the equation used to model their combined effort to finish the room in 4 hours is ${}6 + t = 4$.