The distance between A and B is 210 kilometers. Car A and B start from A and B at the same time and drive toward each other. Car A travels 70 kilometers per hour, which is five-sevenths of the speed of car B. Speed, how many hours will the two cars meet?
甲、乙两地相距210千米，A车和B车分别从甲、乙两地同时出发相向而行，A车每小时行70千米，是B车速度的七分之五，照这样的速度，几小时两车相遇？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">70 / (5/7)</gadget>
<output>98</output>

<gadget id="calculator">70 + 98</gadget>
<output>168</output>

<gadget id="calculator">210 / 168</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>