kelly-chapman_6098169485c8c
kelly-chapman_6098169485c8c
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Jack can paint 1/12 apartment in 1 hour. His wife can paint 1/20 apartment in 1 hour. Together they can paint (1/12 + 1/20 = 32/240 = 2/15) apartment in 1 hour. Therefore it will take them 15/2 hrs = 7 hrs 30 min to paint an apartment together.