Two cars A and B drive from two places 300 kilometers apart at the same time. After 2 hours of meeting, the speed ratio of A and B is known to be 7:8. When they meet, car A travels less than car B. How many kilometers?
甲、乙两辆汽车同时从相距300千米的两地相对开出，经过2小时相遇，已知甲、乙两车的速度比是7：8，相遇时，甲车比乙车少行了多少千米？
<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(8/15) - (7/15)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">300 * (1/15)</gadget>
<output>20</output>

<result>20</result>