Mom rides an electric bike from town A to town B for 2 hours, traveling 15 kilometers per hour, and returning 3 hours, how many kilometers per hour when returning?
妈妈骑电动车从甲镇到乙镇用了2小时，每小时行15千米，返回时用了3小时，返回时每小时行多少千米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * (2/3)</gadget>
<output>10</output>

<result>10</result>