Liangliang walks from home to school at 5 kilometers per hour, and rides a bicycle at 13 kilometers per hour when returning home. The cycling time is 4 hours less than the walking time. How many kilometers away is Liangliang's home from school?
亮亮从家步行去学校，每小时行5千米，回家时骑车，每小时行13千米，骑车的时间比步行的时间少4小时，亮亮家离学校多少千米．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">13 - 5</gadget>
<output>8</output>

<gadget id="calculator">20 / 8</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 13</gadget>
<output>65/2 = around 32.5</output>

<result>65/2 = around 32.5</result>