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 simultaneously?

Correct answer:

t =  1800 s

Step-by-step explanation:

V=126 hl l=126 100  l=12600 l Q=2.1+3.5=5.6 l/s  V2=54 V=54 12600=54 12600=550400=10080 l  t=V2/Q=V2/528=10080/5.6=1800 s

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