If an airplane flies s km in 3 hours, what is the average number of km per hour?
一架飞机3小时飞行s千米，平均每小时飞行多少千米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>