Dongdong usually goes to school every day by walking for 10 minutes and then running for 2 minutes. One day he started running after walking for 6 minutes, but he arrived 2 minutes earlier than usual. May I ask: How many times is Dongdong's running speed faster than his walking speed?
冬冬平时每天上学都是先步行10分钟后再跑步2分钟，某天他步行6分钟后就开始跑步，结果比平时早到了2分钟，请问：冬冬跑步的速度是步行速度的几倍？
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>