Shared work
With only the small valve open, all of the liquid can be drained from a large vat in 4 hours. With only the large valve open, all of the liquid can be drained from the same vat in 2 hours. How long would it take to drain the vat with both valves open?
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--------Hours-----Rate---
small----4-------- 1/4
large----2-------- ...
Solution Summary
This shows how to determine drainage time.
$2.19