A bus and a truck are traveling towards each other from places A and B, which are 850 kilometers apart. The speed of the bus is 90 km/h, and the speed of the truck is 80 km/h. How many hours later will the two cars meet?
客车、货车分别从相距850千米的甲、乙两地相向而行，客车速度是90千米/时，货车速度是80千米/时，几小时后两车相遇？
<gadget id="calculator">90 + 80</gadget>
<output>170</output>

<gadget id="calculator">850 / 170</gadget>
<output>5</output>

<result>5</result>