If A alone completes a project in 6 days, and B alone completes 1/5 of the project in 2 days, how much is the total project completed in 2 days by both of them?
一项工程，甲独做6天完成，乙独做2天完成这项工程的(1/5)，两人合做2天完成全工程的多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 2</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">(4/15) * 2</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>