Asked by Smith

If sally can paint a house in 4hrs, and John can paint the same house in 6hrs, How long will it take for both of them to paint the house together?

Answers

Answered by Reiny
Sally's rate = house/4
Johns rate = house/4

working together = house/(house/4 + house/6)
= house/(10house/24)
= house * 24 10house
= 24/10 = 2.4

it will take 2.4 hrs or 2hrs, 24 minutes
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