Cars A and B leave from A and B at the same time, drive towards each other, and meet each other 10 hours later. When they meet, car A has driven 60% of the whole journey, which is exactly 300 kilometers longer than car B. How many kilometers does car A travel per hour?
甲、乙两车同时从A、B两地开出，相对而行，10小时后相遇．相遇时，甲车行驶了全程的60%，刚好比乙车多行驶300千米，甲车每小时行驶多少千米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">300 / (1/5)</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 * (3/5)</gadget>
<output>900</output>

<gadget id="calculator">900 / 10</gadget>
<output>90</output>

<result>90</result>