The distance from city A to city B is 420 kilometers. A car travels 60% of the journey at 3 o'clock. How many kilometers per hour does the car travel on average?
从甲城到乙城有420千米．一辆汽车3时行驶了全程的60%，这辆汽车平均每时行驶多少千米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">420 * (1/5)</gadget>
<output>84</output>

<result>84</result>