A car has to go a distance of 540 kilometers, and it has been going for 3 hours, at a distance of 40 kilometers per hour. The remaining distance is 42 kilometers per hour. How many hours will it take to complete this distance?
一辆汽车要走540千米的路程，已经走了3小时，每小时走40千米．剩下的路程每小时走42千米，还要走多少小时才能走完这段路？
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">540 - 120</gadget>
<output>420</output>

<gadget id="calculator">420 / 42</gadget>
<output>10</output>

<result>10</result>