The diesel oil carried by a small marine research vessel can only be used for 18 hours at most. The research ship set sail from the pier, sailed along the current, and traveled 40 kilometers per hour; when it returned, it traveled against the current, and traveled the distance per hour (4/5). For the sake of safety, how far should the scientific research ship sail before returning?
一艘小型海洋考察船所带的柴油最多只能用18小时．这艘考察船从码头启航出海，驶出时顺水，每小时行40千米；返航时逆水，每小时行的路程是去时的(4/5)．为了安全起见，这艘科考船最多驶出多远就应该返航？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 * (4/5) * 18</gadget>
<output>576</output>

<gadget id="calculator">40 * (4/5)</gadget>
<output>32</output>

<gadget id="calculator">40 + 32</gadget>
<output>72</output>

<gadget id="calculator">576 / 72</gadget>
<output>8</output>

<gadget id="calculator">40 * 8</gadget>
<output>320</output>

<result>320</result>