Uncle Wang drove from Shuifu to Zhaotong, traveling 80 kilometers per hour, and it took 5 hours to reach the destination; after filling up the goods, it took 8 hours to transport them back to Shuifu, how many kilometers per hour did they travel on average?
王叔叔开车从水富去昭通，每小时行80千米，行5小时达到；装满货物后运回水富，用了8小时，回来平均每小时行多少千米？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">80 * (5/8)</gadget>
<output>50</output>

<result>50</result>