Pumps

Five pumps pumped 1,800 hl of water for 3 hours. How many hectoliters of water pump same two powerful pumps for six hours?

Correct result:

x =  1440 hl

Solution:

$$\begin{gathered} p_1=1800\mathrm{/}3\mathrm{/}5=120 \\ x=2\cdot 6\cdot p_1=2\cdot 6\cdot 120=1440\text{ hl} \end{gathered}$$

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