The distance between A and B ports is 312 kilometers. It takes 12 hours for a ship to travel from port A to port B, and it takes 13 hours for another ship to travel from port B to port A. How many hours did the two ships sail opposite each other from the two ports at the same time?
甲乙两港相距312千米．一艘轮船从甲港开往乙港需12小时，另一艘轮船从乙港开往甲港需13小时．两艘轮船同时从两港相对开出，经过几小时相遇？
<gadget id="calculator">312 / 13</gadget>
<output>24</output>

<gadget id="calculator">312 / 12</gadget>
<output>26</output>

<gadget id="calculator">24 + 26</gadget>
<output>50</output>

<gadget id="calculator">312 / 50</gadget>
<output>156/25 = around 6.24</output>

<result>156/25 = around 6.24</result>