steamship sailed from Shanghai Port to Wuhan Port, traveled 25 kilometers per hour downstream, and spent 75 hours upstream on the way back. It is known that the water flow in this channel is 5 kilometers per hour. How many kilometers is the distance between Shanghai Port and Wuhan Port?
一只轮船从上海港开往武汉港，顺流而下每小时行25千米，返回时逆流而上用了75小时．已知这段航道的水流是每小时5千米，求上海港与武汉港相距多少千米？
<gadget id="calculator">25 - 5 - 5</gadget>
<output>15</output>

<gadget id="calculator">15 * 75</gadget>
<output>1_125</output>

<result>1_125</result>