Xiao Ming's running speed is three times faster than his walking speed, and he walks from home to school every day. One day, because he started 10 minutes late, he had to run half of the distance and walk the other half, so that he arrived at school at the same time as usual. So how many minutes does it take Xiao Ming to walk to school every day?
小明跑步速度是步行速度的3倍，他每天从家到学校都是步行．有一天由于晚出发10分钟，他不得不跑步行了一半路程，另一半路程步行，这样与平时到达学校的时间一样．那么小明每天步行上学需要时间多少分钟？
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">10 / (2/3)</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>