To find the length of each section of the board after Darren cuts it into 3 equal parts, we start by dividing the total length of the board by the number of sections:
- The total length of the board is \( \frac{3}{5} \) meters.
- He cuts the board into 3 equal parts, so we divide \( \frac{3}{5} \) by 3:
\[ \frac{3}{5} \div 3 = \frac{3}{5} \times \frac{1}{3} = \frac{3 \times 1}{5 \times 3} = \frac{3}{15} \]
- We can simplify \( \frac{3}{15} \):
\[ \frac{3}{15} = \frac{1}{5} \]
Therefore, each section of the board is \( \frac{1}{5} \) meters long.
The answer is: One-fifth m.