Teacher Yang’s home is about 15 kilometers away from the library. If you walk, it will take 3 hours to get there. Do the math, how many kilometers does Teacher Yang walk on average per hour?
杨老师家离图书馆约15千米，如果步行，需要3小时到达，算一算，杨老师平均每小时走多少千米？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>