Two trains depart from two places 650 kilometers apart at the same time. The express train travels 80 kilometers per hour, and the slow train travels 50 kilometers per hour. How long does it take for the two trains to meet? (equation solution)
两列火车从相距650千米的两地同时相对开出，快车每小时行80千米，慢车每小时行50千米，两车经过几小时相遇？(方程解)
<gadget id="calculator">80 + 50</gadget>
<output>130</output>

<gadget id="calculator">650 / 130</gadget>
<output>5</output>

<result>5</result>