math
posted by james .
Jane needs to fill her pool with water. Ace said it will take them 40 minutes to fill the pool. Ben said it will take them 60 minutes to fill the pool. How long it will take for both Ace and Ben to fill the pool at the same time?

50 minutes. 40 ÷ 2 = 20 60 ÷ 2 = 30 30 + 20 = 50

I think you need to clarify who "them" is in each case.
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