18. (3 points) A construction team is building a railway tunnel. When they completed $\frac{1}{3}$ of the task, the team adopted new equipment, which increased the construction speed by $20\%$. At the same time, to maintain the new equipment, the working hours per day were reduced to $\frac{4}{5}$ of the original. As a result, the entire project took 185 days to complete. From the above conditions, it can be deduced that, if the new equipment had not been adopted, the project would have taken $\qquad$ days to complete.