Xiao Lingling's mother is going on a business trip. Before leaving home, she is afraid that Lingling will be late for school the next day, so she deliberately sets her watch forward by 5 minutes. The next morning, Lingling went out at 7:15 as usual, because Lingling walked to school that day, so she was slower than usual. When she arrived at school, the school clock was exactly 7:30, and she was usually 7: 25 to school. So, how many minutes did Lingling spend on the road this day than usual?
小玲玲的妈妈要出差了，在离家之前，怕玲玲第二天上学迟到，故意把表拨快了5分钟．第二天早晨，玲玲按平时的时间在7：15出门，因为这天玲玲是走着上学的，所以比平时慢，到学校时学校的表正好是7：30，而她平时都是7：25到校的．那么，这天玲玲在路上比平时多用了多少分钟．
<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">20 - 10</gadget>
<output>10</output>

<result>10</result>