To build a road, the full length (3/7) will be built in the first week, and the first week (1/3) will be repaired in the second week. At this time, there are still 60 kilometers left. How many kilometers is the total length of this road? ?
修一条路，第一周修全长的(3/7)，第二周修的是第一周修的(1/3)，这时还剩60千米，这条路全长多少千米？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/7) * (1/3)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (3/7) - (1/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">60 / (3/7)</gadget>
<output>140</output>

<result>140</result>