Two cars A and B start from AB at the same time and drive toward each other. Car A travels 50 kilometers per hour, and car B travels 40 kilometers per hour.
甲乙两车同时从AB两地出发相向而行，甲车每小时行50千米，乙每小时行40千米，相遇时，甲车行了全程的多少．
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>