The engineering team repaired a road. It was repaired in the first week (1/5) and in the second week (3/10). There are still 340 meters left. How many meters is the total length of this road?
工程队修一条路，第一周修了(1/5)，第二周修了(3/10)，还剩下340米，这条路全长多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/5) - (3/10)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">340 / (1/2)</gadget>
<output>680</output>

<result>680</result>