Two cars, A and B, start from A and B respectively at the same time. After four hours, the two cars meet and continue to drive for three hours. At this time, A is 10 kilometers away from B, and B is 80 kilometers away from A. ． When car A arrives at point B, how many hours will it take for car B to reach point A?
甲、乙两车分别从A，B两地同时相向开出，四小时后两车相遇，然后各自继续行驶三小时，此时甲车距B地10千米，乙车距A地80千米．问甲车到达B地时乙车还要经过多少小时才能到达A地？
<gadget id="calculator">80 - 10</gadget>
<output>70</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">70 / 7</gadget>
<output>10</output>

<gadget id="calculator">10 + 80 + 10</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">80 - 50</gadget>
<output>30</output>

<gadget id="calculator">10 + 30</gadget>
<output>40</output>

<gadget id="calculator">80 / 40</gadget>
<output>2</output>

<gadget id="calculator">70 / 7 / 50</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 - (1/5)</gadget>
<output>9/5 = around 1.8</output>

<result>9/5 = around 1.8</result>