A person is going to ride a bicycle from A to B. When he set off, he made a plan. He rode 10 kilometers per hour at a slow speed and arrived at 1 in the afternoon. Well, at 12 noon, how many kilometers per hour are you riding?
一人准备骑自行车从甲地去乙地，出发时计划了一下，慢速骑每小时走10千米，下午一点才能到，快速骑每小时走15千米，上午十一点就能到，最好中午12点到，每小时骑多少千米．
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">30 / 5 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">10 * (6/5)</gadget>
<output>12</output>

<result>12</result>