Pond

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

Correct result:

t =  60 h

Solution:

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



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