It takes 6 hours for a large harvester and 10 hours for a small harvester to harvest a wheat field. After 2 hours of harvesting by the large harvester, the rest will be harvested simultaneously by two harvesters, the size and size, and it will take several hours to finish harvesting.
收完一块麦地，大收割机需6小时，小收割机需10小时．大收割机收割2小时后，剩下的由大小两台收割机同时收割，还需几小时才能收完．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/6) + (1/10)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(2/3) / (4/15)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>