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Question 930354: if betty paints a fence in 5 hours and mark paints it in 3 hours, how long would it take if they worked together
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! r = w/t
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rates are additive:
1/5 + 1/3
3/15 + 5/15
8/15
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t = w/r
t = 1/(8/15)
t = 15/8
t = 1.875 hours
t = 1 hour and (0.875 * 60 minutes/hour)
t = 1 hour and 52.5 minutes
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