Question 391160
If it takes a bathtub ten minutes to drain and twelve minutes to empty, how long would it take the bathtub to fill if the drain was accidentally left open?
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It must be 10 minutes to fill
filling 10 minutes
1/10 of filling in 1 minute
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draining 12 minutes
1/12 of the draining in 1 minute
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1/10-1/12 =filling done in 1 minute when drain is open.
(6-5)/60
= 1/60
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when drain is open 1/60 of the filling is done in 1 minute.
so it will take 60/1 minutes to fill the tub with drain open.
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m.ananth@hotmail.ca