Uncle Zhang walked 20 kilometers in 3 hours, how many kilometers per hour on average?
张叔叔3小时走了20千米，平均每小时走多少千米？
<gadget id="calculator">20 / 3</gadget>
<output>20/3 = around 6.666667</output>

<result>20/3 = around 6.666667</result>