The school is 9.3 kilometers away from home, and it takes Xiao Ming 0.6 hours to ride a bicycle from home to school; the home is 0.9 kilometers away from the park, and it takes 0.2 hours for Xiao Ming to walk from home to the park. how many kilometers slower in an hour
学校距离家里有9.3千米，小明从家里骑自行车去学校要花0.6小时；家里距离公园有0.9千米，小明从家里走路去公园要0.2小时，那么，小明走路的速度比骑自行车的速度每小时要慢多少千米
<gadget id="calculator">9.3 / 0.6</gadget>
<output>15.5</output>

<gadget id="calculator">0.9 / 0.2</gadget>
<output>4.5</output>

<gadget id="calculator">15.5 - 4.5</gadget>
<output>11</output>

<result>11</result>