The distance between A and B ports is 234 kilometers. It takes 9 hours for a ship to travel from port A to port B, and 13 hours to travel from port B to port A. If the speed of the ship is only half of the original speed, how many hours will it take to travel from port A to port B?
甲乙两港口相距234千米．一艘船从甲港到乙港需要9小时，从乙港到甲港需要13小时，如果这艘船的速度只有原先的一半，那么从甲港到乙港需要多少小时？
<gadget id="calculator">234 / 9</gadget>
<output>26</output>

<gadget id="calculator">234 / 13</gadget>
<output>18</output>

<gadget id="calculator">26 - 18</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">26 + 4</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">234 / 15</gadget>
<output>78/5 = around 15.6</output>

<result>78/5 = around 15.6</result>