Question

It take peter 5 hours to pain a Room. It takes Juan 3.75 hours to paint a Room. How much time would it take for them to paint the Room together?
Peter's rate = 1/5 rooms/hour
Juan's rate = 1/3.75 rooms/hr = 100/375 = 4/15

combined rate = 1/5 + 4/15
= 7/15

time at combined rate = 1/(7/15) hrs
= 15/7 hrs
= aprr 2.14 hrs, or 2 hrs and 9 minutes
Thank you

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