3. (6 points) A construction company was building a tunnel. When $\frac{1}{3}$ of the tunnel was completed at the original speed, they started using new equipment, which increased the construction speed by $20 \%$ and reduced the working hours to $80 \%$ of the original. As a result, it took a total of 185 days to complete the tunnel. If they had not used the new equipment and continued at the original speed, it would have taken $\qquad$ days to complete the tunnel.
3. (6 points) A construction company builds a tunnel. When $\frac{1}{3}$ of the tunnel is completed at the original speed, new equipment is used, increasing the construction speed by $20 \%$ and reducing the daily working hours to $80 \%$ of the original. As a result, the tunnel is completed in 185 days. If the new equipment was not used and the original speed was maintained, it would take $\qquad$ 180 days.

【Solution】Solution: $\left(1-\frac{1}{3}\right) \div[(1+20 \%) \times 80 \%]$
$$
\begin{array}{l}
=\frac{2}{3} \div[120 \% \times 80 \%], \\
=\frac{2}{3} \div \frac{24}{25} \\
=\frac{25}{36} ; \\
185 \div\left(\frac{1}{3}+\frac{25}{36}\right) \\
=185 \div \frac{37}{36}, \\
=180 \text { (days). }
\end{array}
$$

Answer: If the original speed was maintained, it would take 180 days.
Therefore, the answer is: 180.