To build a road, the full length (1/4) was repaired in the first week, and the full length (2/7) was repaired in the second week. It is known that the road is 2.8 kilometers long, and the second week is more than the first week. How much rice?
要修一条公路，第一周修了全长的(1/4)，第二周修了全长的(2/7)，已知这条公路长2.8千米，第二周比第一周多修多少米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/7) - (1/4)</gadget>
<output>1/28 = around 0.035714</output>

<gadget id="calculator">2.8 * (1/28) * 1_000</gadget>
<output>100</output>

<result>100</result>