yacht is full of oil and can sail for 180 hours. It is known that the speed of the yacht in still water is 24 kilometers per hour, and the water speed is 4 kilometers per hour. Now the yacht is required to return to the port along the same route after leaving, and there is no fuel supply on the way. I would like to ask: How far can this yacht drive at most?
一艘游艇装满油，能够航行180个小时．已知游艇在静水中的速度为每小时24千米，水速为每小时4千米，现在要求这艘游艇开出之后沿原路回港，而且中途没有油料补给．请问：这艘游艇最多能够开出多远？
<gadget id="calculator">180 * 24 * 24</gadget>
<output>103_680</output>

<gadget id="calculator">180 * 4 * 24</gadget>
<output>17_280</output>

<gadget id="calculator">180 * 24 * 4</gadget>
<output>17_280</output>

<gadget id="calculator">180 * 4 * 4</gadget>
<output>2_880</output>

<gadget id="calculator">17_280 - 17_280 - 2_880</gadget>
<output>-2_880</output>

<gadget id="calculator">103_680 + (-2_880)</gadget>
<output>100_800</output>

<gadget id="calculator">4 - 4</gadget>
<output>0</output>

<gadget id="calculator">24 + 24 + 0</gadget>
<output>48</output>

<gadget id="calculator">100_800 / 48</gadget>
<output>2_100</output>

<result>2_100</result>