Little Ding Ding’s home is 1 km away from the school. He rode a round trip in 20 minutes. What is his cycling speed?
小丁丁家到学校有1km，他20分钟骑了一个来回，他骑车的速度是多少．
<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 * (1/10)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>