The distance between the two places is 405 kilometers. The speed ratio of cars A and B is 4:5. Car A travels 36 kilometers per hour. Cars A and B travel towards each other from the two places. How long will they meet?
两地相距405千米，甲、乙两车速度比是4：5，甲车每小时行36千米，甲、乙两车从两地相向而行，几小时相遇？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">36 * (5/4)</gadget>
<output>45</output>

<gadget id="calculator">36 + 45</gadget>
<output>81</output>

<gadget id="calculator">405 / 81</gadget>
<output>5</output>

<result>5</result>