Li Hua walked to school for 5 minutes every day, and ran for 2 minutes to get to school. One day, he started running after walking for 2 minutes, and it turned out to be 1 minute and 40 seconds early. His running speed was how many times faster than his walking speed.
李华每天上学步行5分钟以后，跑步2分钟到校．有一天，他步行2分钟以后就开始跑步，结果早到了1分40秒，他跑步的速度是步行速度的多少倍．
<result>2.25</result>