A and B are walking towards each other from places A and B at the same time, and it will take 6 hours for A to complete the trip. The ratio of the distance traveled by the two when they meet is 3:2, at this time, A travels 18 kilometers longer than B. What is the speed of A in kilometers per hour?
甲乙两人同时从A、B两地相向而行，甲行完全程要6小时．两人相遇时所行路程之比为3：2，这时甲比乙多行18千米．求甲的速度是每小时多少千米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 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">18 / (1/5) / 6</gadget>
<output>15</output>

<result>15</result>