The distance between AB and AB is 837 kilometers. Cars A and B start from the two places at the same time and drive toward each other. Car A travels 105 kilometers per hour, and car B travels 81 kilometers per hour. How long will the two cars meet?
AB两地相距837千米，甲乙两车同时从两地出发，相向而行．甲车每小时行105千米，乙车每小时行81千米，几小时两车相遇？
<gadget id="calculator">105 + 81</gadget>
<output>186</output>

<gadget id="calculator">837 / 186</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>