The distance from Xiaohong’s home to school is 990 meters. She walked to school for 15 minutes in the morning and arrived home in 18 minutes after school.
小红家到学校的距离是990米，早上她步行15分钟到学校，放学时用了18分钟到家，上学时的速度比放学时的速度快多少？
<gadget id="calculator">990 / 15</gadget>
<output>66</output>

<gadget id="calculator">990 / 18</gadget>
<output>55</output>

<gadget id="calculator">66 - 55</gadget>
<output>11</output>

<result>11</result>