Anonymous
Anonymous asked in Education & ReferenceHomework Help · 1 decade ago

If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for?

I assume it would be more like 2hours and a half, but I don't know how to solve it. Would you please help me out?

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  • 1 decade ago
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    Sally does 1/4 of the job in one hour and John does 1/6, so together they do (1/4 + 1/6)

    = 3/12 + 2/12

    = 5/12 of the job in one hour

    So it would take 12/5 hours to finish. That's 2 2/5 hours or 2 hours and 24 minutes.

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