A person rides a train for 4 hours, and rides a horse for 4 hours, and travels a total of 300 kilometers. If the train travels 60 kilometers per hour, how many kilometers per hour will the horse travel?
一个人坐4小时火车，又骑4小时马，共行300千米，如火车每小时行60千米，骑马每小时行多少千米？
<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">300 - 240</gadget>
<output>60</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>