Xiaoli goes to work and rides uphill at 10 kilometers per hour when she goes to work. When she returns home, she goes back downhill and travels 20 kilometers per hour on the same road. It took her 3 hours to go to and from get off work. Calculate how far she has to go to work ?
小丽去上班，去时上坡骑车每小时行10千米，回家时下坡原路返回每小时行20千米，她上，下班用了3小时，算一算她上班要走多远？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

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

<gadget id="calculator">10 * 3 * (2/3)</gadget>
<output>20</output>

<result>20</result>