Forgets 2612

It happens to Dorothy that when filling the bath with water, she forgets to put a plug in the drain. The bath would fill up in 20 minutes if the drain were blocked. A full tub would be emptied through the drain in 30 minutes. How long will it take Dorothy to fill the bathtub if she forgets to plug the drain?

Final Answer:

t =  60 min

Step-by-step explanation:

a=20 min b=30 min  (1/a1/b) t=1 (1/201/30) t=1  t=60  t=160=60  t=60=60 min



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