A bus drives from City A to City B. It takes 3 hours to go there, traveling 80 kilometers per hour, and it takes 2 hours to return. How many kilometers per hour is the average round trip?
一辆大客车从甲城开往乙城，去时用了3小时，每小时行驶80千米，回来时用了2小时，来回平均每小时行驶多少千米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 * 3 * (2/5)</gadget>
<output>96</output>

<result>96</result>