Zhao Qiang walks to school for 10 minutes every day, then runs for 2 minutes, and arrives at school just in time. One day he started running after walking for 5 minutes, but he arrived 3 minutes early. How many times faster is his running speed than his walking speed?
赵强每天上学步行10分钟以后，再跑步2分钟，恰好到校．有一天他步行5分钟后就开始跑步，结果早到了3分钟，他跑步速度是步行速度的多少倍？
<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">12 - 8 - 2</gadget>
<output>2</output>

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

<result>5/2 = around 2.5</result>