A highway has been built for 320 meters, which accounts for exactly (4/5) of the total length. How long is the road in meters?
一条公路已修320米，正好占全长的(4/5)．公路全长多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">320 / (4/5)</gadget>
<output>400</output>

<result>400</result>