A highway team repaired 420 kilometers of roads. On the first day, the entire road was repaired (5/7). How many kilometers were repaired on the first day?
一公路队修路420千米，第一天修了全程的(5/7)，第一天修了多少千米？
<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>