A construction company builds a tunnel. When it is built at the original speed (1/3), the construction speed is increased by 20% by using new equipment, and the daily working hours are shortened to 80% of the original. As a result, it takes 185 days to complete the tunnel. If How many days will it take to complete the construction at the original speed without new equipment.
建筑公司建一条隧道，按原速度建成(1/3)时，使用新设备，使修建速度提高了20%，并且每天的工作时间缩短为原来的80%，结果共用185天建完隧道，若没有新设备，按原速度建完，则需要多少天．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(6/5) * (4/5)</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">(2/3) / (24/25)</gadget>
<output>25/36 = around 0.694444</output>

<gadget id="calculator">(1/3) + (25/36)</gadget>
<output>37/36 = around 1.027778</output>

<gadget id="calculator">185 / (37/36)</gadget>
<output>180</output>

<result>180</result>