The diesel oil carried by a ship can be used for up to 6 hours. When driving out, the wind is down, and the speed is 30 kilometers per hour. When returning to the headwind, the distance traveled per hour is 80% of the tailwind. How far can this ship travel at most and must turn back?
一艘轮船所带的柴油最多可以用6小时．驶出时顺风，每小时行30千米．返回时逆风，每小时行的路程是顺风的80%．这艘轮船最多行多远必须返航？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 * (4/5) * 6</gadget>
<output>144</output>

<gadget id="calculator">30 * (4/5)</gadget>
<output>24</output>

<gadget id="calculator">30 + 24</gadget>
<output>54</output>

<gadget id="calculator">144 / 54</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">30 * (8/3)</gadget>
<output>80</output>

<result>80</result>