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 the speed of car B (5/7). The speed can meet in a few hours?
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(5/7)，照这样的速度几小时后可以相遇？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">70 * (5/7)</gadget>
<output>50</output>

<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">210 / 120</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>