The distance between A and B is 420 kilometers, and a passenger car plans to drive 7 hours from A to B. Actually drive 10 kilometers more per hour than originally planned, how many hours will it actually arrive?
甲、乙两地相距420千米，一辆客车从甲地到乙地计划行驶7小时．实际每小时比原计划多行驶10千米，实际几小时到达？
<gadget id="calculator">420 / 7</gadget>
<output>60</output>

<gadget id="calculator">60 + 10</gadget>
<output>70</output>

<gadget id="calculator">420 / 70</gadget>
<output>6</output>

<result>6</result>