It takes 8 days for A to transport a batch of goods alone, 10 days for B to transport alone, and one day for the two teams to transport together.
一批货物甲单独运需8天，乙独运需10天，两队合运一天，共运了这批货的多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<result>9/40 = around 0.225</result>