In the handicraft class, Lan Lan took (1/6) less time to complete the work than Li Qiang (1/10), how long did it take Li Qiang?
手工课上，兰兰完成作品用了(1/6)时，比李强少用了(1/10)时，李强用了多长时间？
<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>

<result>4/15 = around 0.266667</result>