Two people, A and B, start from two places 100 kilometers apart and walk towards each other at the same time. A walks 8 kilometers per hour, and B walks 12 kilometers per hour. When will A and B meet each other?
AB两人从相距100千米的两地同时出发相向而行，A每小时走8千米，B每小时走12千米，A，B两人几小时相遇？
<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<gadget id="calculator">100 / 20</gadget>
<output>5</output>

<result>5</result>