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October 21, 2014

October 21, 2014

Posted by **robin** on Saturday, January 26, 2013 at 3:52pm.

- math -
**Reiny**, Saturday, January 26, 2013 at 5:04pm3 pumps ----> working 6 hours --- 2 days

6 pumps ----> working 6 hours --- 1 day

1 pump -----> working 36 hrs ---- -1 day

9 pumps ----> working 4 hrs ------ 1 day

or

it takes 18 pump-hrs running for 2 days

it takes 36 pump-hrs to do it in 1 day

so 9 pumps would take 4 hrs to do it in 1 day

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