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2014-05-14T09:06:36+08:00

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Rate of Aaron: 1/15
Rate of Kit: 1/16

Let 1/t be the rate if they work together:
1/15 +1/16 = 1/t

31/240 = 1/t

t= 240/31

Therefore, together they can finish it in 240/31 days (less than 8 days)
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