SOLUTION: One pump can empty a pool in 7 days, whereas a second pump can empty the pool in 11 days. How long will it take the two pumps, working together, to empty the pool? It will take

Algebra ->  Customizable Word Problem Solvers  -> Finance -> SOLUTION: One pump can empty a pool in 7 days, whereas a second pump can empty the pool in 11 days. How long will it take the two pumps, working together, to empty the pool? It will take      Log On

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Question 1160431: One pump can empty a pool in 7 days, whereas a second pump can empty the pool in 11 days. How long will it take the two pumps, working together, to empty the pool?
It will take the two pumps ? days to empty the pool together.
If needed, round answer to 3 decimal places.
Answer by josgarithmetic(39626) About Me  (Show Source):
You can put this solution on YOUR website!
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It will take the two pumps ? days to empty the pool together.
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It will take the two pumps highlight%281%2F%281%2F7%2B1%2F11%29%29 days to empty the pool together.

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Two different pumps, can empty a pool, ONE pool.
The rates of these pumps in POOL per DAYS:
1%2F7 and 1%2F11.

If both pumps are working at the same time, then their combined rate is 1%2F7%2B1%2F11
%2811%2F11%29%281%2F7%29%2B%287%2F7%29%281%2F11%29
11%2F77%2B7%2F77
18%2F77---------again this rate is POOLs PER DAYS.


Your questions asks for how many DAYS per POOL. This is the reciprocal , or 77%2F18 DAYS to empty this ONE pool. You can do the necessary arithmetic.