Five pumps

The water tank is filled with two pumps in 48 minutes. How long would it take to fill it with 5 same pumps?

Correct result:

x =  19.2 min

Solution:

$x=48\cdot {\displaystyle \frac{2}{5}}={\displaystyle \frac{96}{5}}={\displaystyle \frac{96}{5}}\text{ min}=19.2\text{ min}$

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