There are three piers A, B, and C, and the distance between BC and BC is 24km. After a ship goes down from B to A, it immediately goes up to C. Take 8 hours together, the known water velocity is 5km/h, the speed of the boat in still water is 20km/h, find the distance between A and B.
有A、B、C三个码头，BC相距24km，某船从B顺水而下到达A后，立即逆水而上到达C．共用8h，已知水流速度为5km/h，船在静水中的速度为20km/h，求A、B之间的距离．
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">24 / 15</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">8 - (8/5)</gadget>
<output>32/5 = around 6.4</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/25) + (1/15)</gadget>
<output>8/75 = around 0.106667</output>

<gadget id="calculator">(32/5) / (8/75)</gadget>
<output>60</output>

<result>60</result>