Two caterpillars start from both ends of a line at the same time, and meet each other in 10 minutes. If the beetle walks the line alone, it takes 15 minutes to climb from one end to the other. How many minutes does it take for the caterpillar to walk alone in the line?
两毛毛虫，从一线段的两端同时出发，10分钟相遇，如果甲虫独行这条线段，则15分钟才能从一端爬到另一端，那么乙虫独行这条线段要多少分钟？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) - (1/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / (1/30)</gadget>
<output>30</output>

<result>30</result>