car drives from A to B on a mountain road, travels 48 kilometers per hour up the mountain, arrives in 5 hours, and returns to B in 3 hours. How many kilometers per hour does the car travel on average for a round trip?
一辆汽车走山路，从甲地开往乙地，上山每小时行驶48千米，5小时到达，返回时用3小时返回乙地．这辆汽车往返一次平均每小时行驶多少千米？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">48 * 5 * (1/4)</gadget>
<output>60</output>

<result>60</result>