Two people, A and B, start from east and west at the same time and walk toward each other. After 2 hours of departure, the distance between the two is 54 kilometers. After 5 hours, the distance between the two is 27 kilometers (they have not met yet). people meet?
甲、乙两人分别从东西两地同时出发相向而行，出发2小时后，两人相距54千米，出发5小时后，两人相距27千米(还未相遇)，问出发多少小时两人相遇？
<gadget id="calculator">54 - 27</gadget>
<output>27</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<gadget id="calculator">27 / 9</gadget>
<output>3</output>

<gadget id="calculator">2 + 5 + 3</gadget>
<output>10</output>

<result>10</result>