The distance between A and B is 300 kilometers. Two people, A and B, face each other from A and B at the same time. A travels 70 kilometers per hour, and B travels 80 kilometers per hour. How many hours later will they meet?
AB两地相距300千米，甲乙二人分别从AB两地同时相向，甲每小时行70千米，乙每小时行80千米，几小时后两人相遇？
<gadget id="calculator">70 + 80</gadget>
<output>150</output>

<gadget id="calculator">300 / 150</gadget>
<output>2</output>

<result>2</result>