Pond

Workers will empty a pond with two open floodgates in 20 days. A larger floodgate will empty the whole pond in 30 days. For how long would he be emptied with a smaller floodgate?

Correct answer:

t =  60 h

Step-by-step explanation:

20 (1/t+1/30)=1 20+ 20/30t = t t=20/(120/30)=60 h



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