The distance between A and B is 90 kilometers. Xiaoqiang rides a bicycle from A to B at a speed of 12 kilometers per hour, and Xiaojun rides a bicycle from B to A at a speed of 13 kilometers per hour. The two walked the same road and met after how many hours?
甲乙两地相距90千米，小强骑自行车以12千米/时的速度从甲地去乙地，小军骑自行车以13千米/时的速度从乙地去甲地．两人走同一条路，经过几小时相遇？
<gadget id="calculator">12 + 13</gadget>
<output>25</output>

<gadget id="calculator">90 / 25</gadget>
<output>18/5 = around 3.6</output>

<result>18/5 = around 3.6</result>