To calculate the total distance swum by the four friends, you can multiply the distance each friend swims by the number of friends:
\[ \text{Distance each friend swims} = \frac{3}{5} \text{ miles} \]
\[ \text{Number of friends} = 4 \]
Now, multiply the distance by the number of friends:
\[ \text{Total distance} = 4 \times \frac{3}{5} \]
To perform the multiplication:
\[ \text{Total distance} = \frac{4 \times 3}{5} = \frac{12}{5} \text{ miles} \]
To convert \(\frac{12}{5}\) into a mixed number:
\[ \frac{12}{5} = 2 \frac{2}{5} \text{ miles} \]
Thus, the total distance they swim is \(\frac{12}{5}\) miles or \(2 \frac{2}{5}\) miles.
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