The distance between A and B is 420 kilometers. A car travels the whole distance (5/7). How many kilometers does it travel?
甲乙两地相距420千米，一辆汽车行驶了全程的(5/7)，行驶了多少千米？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">420 * (5/7)</gadget>
<output>300</output>

<result>300</result>