Working together, rocco and giulia can paint a room in 3 hours. it would have taken rocco 7 hours to do the job alone. which equation can be used to determine r, giulia’s rate of work in parts per hour

Rocco and Guilia can paint and finish together in 3 hours while Rocco alone can do it alone in 7 hours. Guilia at the rate of 1/r can finish the job expressed in the following equation. 1/3= 1/7+1/r. Getting r, r is equal to 5.25 hrs. Hence, Guilia can do painitng alone in 5.25 hrs.

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