# Five inlets

The tank can be filled with five equally powerful inlets. If the tank is filled by four of these inlets, it takes a total of 30 minutes to fill one-third of the tank. How many minutes does it take to fill an empty tank if it is filled with all five inlets?

Correct result:

t =  72 min

#### Solution:

$s=4 \cdot \ 3 \cdot \ 30=360 \ \text{min} \ \\ \ \\ t=s/5=360/5=72 \ \text{min}$

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