The distance between A and B is 665 kilometers. The passenger car and the truck depart from the two places at the same time and meet each other after 7 hours. The speed of the truck is (9/10) that of the passenger car, how many kilometers per hour does the passenger car travel.
甲乙两地相距665千米，客车和货车分别从两地同时出发，7小时后相遇．货车速度是客车的(9/10)，客车每小时行多少千米．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 + (9/10)</gadget>
<output>19/10 = around 1.9</output>

<gadget id="calculator">665 / 7 / (19/10)</gadget>
<output>50</output>

<result>50</result>