It takes 11 hours for a ship to sail 150 kilometers along the current and 144 kilometers against the current; it also takes 11 hours to sail 90 kilometers along the current and 192 kilometers against the current. Find the speed of the current?
一艘轮船顺水航行150千米，逆水航行144千米共用11小时；顺水航行90千米，逆水航行192千米也用11小时，求水流速度？
<gadget id="calculator">150 - 90</gadget>
<output>60</output>

<gadget id="calculator">192 - 144</gadget>
<output>48</output>

<gadget id="calculator">60 / 48</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">144 * (5/4)</gadget>
<output>180</output>

<gadget id="calculator">150 + 180</gadget>
<output>330</output>

<gadget id="calculator">330 / 11</gadget>
<output>30</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">150 * (4/5)</gadget>
<output>120</output>

<gadget id="calculator">144 + 120</gadget>
<output>264</output>

<gadget id="calculator">264 / 11</gadget>
<output>24</output>

<gadget id="calculator">30 - 24</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<result>3</result>