The distance between A and B cities is 435 kilometers. Two motorcycles drive from the two cities at the same time. It is known that one motorcycle travels 84 kilometers per hour, and the other motorcycle travels 90 kilometers per hour. How many hours later will the two cars meet?
甲乙两城相距435千米，两辆摩托车同时从两城相对开出，已知一辆摩托车每小时行84千米，另一辆摩托车每小时行90千米．多少小时后两车相遇？
<gadget id="calculator">84 + 90</gadget>
<output>174</output>

<gadget id="calculator">435 / 174</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>