Question: thank you for your help. One pump can empty a pool in 7 days, whereas a second pump can empty the pool in 13 days.

thank you for your help.

One pump can empty a pool in 7 days, whereas a second pump can empty the pool in 13 days. How long will it take the two pumps, working together, to empty the pool? (Fractional answers are OK.) The first pump's rate is per day. The second pump's rate is per day. The combined pumps rate is per day. It will take the two pumps days to empty the pool together

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