Xiaowei and Xiaogang set off from place A at the same time on bicycles and ride in opposite directions. (1/2) hour later, the distance between the two is 10 kilometers, and the speed ratio of Xiaowei and Xiaogang is 2:3. How many kilometers does Xiaogang travel per hour?
小伟和小刚骑自行车同时从甲地出发，向相反的方向骑去．(1/2)小时后，两人相距10千米，小伟和小刚的速度比是2：3．小刚每小时行多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 / (1/2)</gadget>
<output>20</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 * (3/5)</gadget>
<output>12</output>

<result>12</result>