The speed of the boat in still water is 25 kilometers per hour, and the speed of the river is 5 kilometers per hour. It takes a boat 10 hours to go back and forth between A and B ports. What is the distance in kilometers between the two ports?
船在静水中的速度是每小时25千米，河水流速为每小时5千米，一只船往返甲、乙两港共花了10小时，则两港相距多少千米？
<gadget id="calculator">10 * 25 * 25</gadget>
<output>6_250</output>

<gadget id="calculator">10 * 5 * 25</gadget>
<output>1_250</output>

<gadget id="calculator">10 * 25 * 5</gadget>
<output>1_250</output>

<gadget id="calculator">10 * 5 * 5</gadget>
<output>250</output>

<gadget id="calculator">1_250 - 1_250 - 250</gadget>
<output>-250</output>

<gadget id="calculator">6_250 + (-250)</gadget>
<output>6_000</output>

<gadget id="calculator">5 - 5</gadget>
<output>0</output>

<gadget id="calculator">25 + 25 + 0</gadget>
<output>50</output>

<gadget id="calculator">6_000 / 50</gadget>
<output>120</output>

<result>120</result>