The distance between A and B cities is 480 kilometers. A car drives from A to B at 9:00 in the morning. It takes 2/3 of the journey in 4 hours. How many kilometers does it travel on average per hour?
甲乙两城相距480千米，一辆汽车上午9：00从甲城开往乙城，4小时行了全程的(2/3)，平均每小时行多少千米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) / 4</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">480 * (1/6)</gadget>
<output>80</output>

<result>80</result>