Hectoliters of water

The pool has a total of 126 hectoliters of water. The first pump draws 2.1 liters of water per second. A second pump pumps 3.5 liters of water per second.

How long will it take both pumps to drain four-fifths of the water at the same time?

Correct result:

t =  1800 s


V=126 hl l=126 100  l=12600 l Q=2.1+3.5=5.6 l/s  V2=45 V=45 12600=10080 l  t=V2/Q=10080/5.6=1800 s

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