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?

Correct answer:

x =  60 min

Step-by-step explanation:


(1/20-1/30)x = 1

(1/20-1/30)·x = 1

x = 60


x = 60/1 = 60

x = 60

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