Two people, A and B, start from two places 40 kilometers apart at the same time and walk toward each other. A travels 6 kilometers per hour, and B travels 4 kilometers per hour. When they meet, how much more kilometers will A travel than B?
甲、乙两人分别从相距40千米的两地同时出发相向而行，甲每小时行6千米，乙每小时行4千米，相遇时甲比乙多行多少千米？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>