According to the calculation of work efficiency, it takes 6 hours for a large harvester and 10 hours for a small harvester to harvest the wheat in a field. Now, the large and small harvesters harvest at the same time. How long will it take to harvest?
按工效计算，收完一块地的麦子，大型收割机需6小时，小型收割机需10小时，现大、小两台收割机同时收割，几小时收完？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</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">1 / (4/15)</gadget>
<output>15/4 = around 3.75</output>

<result>15/4 = around 3.75</result>