The construction team built a road. Repair 380 meters on the first day and 420 meters on the second day. On the second day, more full-length (1/42) was done than on the first day. How many meters is this road?
工程队修一条公路．第一天修380米，第二天修420米．第二天比第一天多修全长的(1/42)．这条公路长多少米？
<gadget id="calculator">420 - 380</gadget>
<output>40</output>

<gadget id="calculator">1 / 42</gadget>
<output>1/42 = around 0.02381</output>

<gadget id="calculator">40 / (1/42)</gadget>
<output>1_680</output>

<result>1_680</result>