David and Fiona have a house painting business. Fiona can paint a house in 3 days, David can paint the same house in 4. How quickly could they paint it together?

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asked Sep 18, 2018 82.3k views

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Tim Farley · Answer 1 · 2018-09-24T11:40:25+0000

3.5 days!

Just because they work together, it doesn't mean they'll work twice as fast!

Find the average of the two by adding 3 and 4 to get 7 and then divide by 2 to get 3 and a half hour.

I think. xD This is kind of tricky.

David and Fiona have a house painting business. Fiona can paint a house in 3 days, David can paint the same house in 4. How quickly could they paint it together?

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