Two people, A and B, are moving from two places 55 kilometers apart to the starting point of the other at the same time at a speed of 4.5 kilometers per hour and 5.5 kilometers per hour. When two people are 13 kilometers apart from face to face to 13 kilometers away from back to back, how many hours have they walked?
甲乙两人分别以每小时4.5千米，每小时5.5千米的速度，从相距55千米的两地同时向对方出发地前进．当两人从面对面相距13千米到背对背相距13千米，他们走了多少小时．
<gadget id="calculator">13 + 13</gadget>
<output>26</output>

<gadget id="calculator">4.5 + 5.5</gadget>
<output>10</output>

<gadget id="calculator">26 / 10</gadget>
<output>13/5 = around 2.6</output>

<result>13/5 = around 2.6</result>