The distance between A and B is 90 kilometers. A and B walk towards each other from A and B at the same time. A travels 18 kilometers per hour, which is equivalent to (2/3) of the distance traveled by B per hour. How many hours did A and B meet?
A、B两地相距90千米，甲、乙两人同时从A、B两地相向而行，甲每小时行18千米，相当于乙每小时所行路程的(2/3)，经过几小时甲、乙两人相遇？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 / (2/3)</gadget>
<output>27</output>

<gadget id="calculator">18 + 27</gadget>
<output>45</output>

<gadget id="calculator">90 / 45</gadget>
<output>2</output>

<result>2</result>