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How long will it take for the tub to completely empty with thte drain open and the water running at full speed?

Given: it takes 20 minutes to fill the tub and 15 minutes to drain the tub when the water is on all the way, full speed.

2 answers

1/20 - 1/15 = -1/60

So, 1/60 of the tub drains every minute.
. . .

how'd you get 1/20-1/15?

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