The distance between A and B is 475 kilometers. The passenger car and the truck leave from the two places at the same time. It is known that the truck travels 45 kilometers per hour. The speed ratio of the truck and the bus is 9:10. How many hours will it take for the two cars to meet?
甲乙两地相距475千米，客车和货车同时从两地相对开出，已知货车每小时行45千米，货车与客车的速度比是9：10，经过几小时两车才能相遇？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">45 / (9/10)</gadget>
<output>50</output>

<gadget id="calculator">45 + 50</gadget>
<output>95</output>

<gadget id="calculator">475 / 95</gadget>
<output>5</output>

<result>5</result>