A ship sailed from Shanghai to Hankou, and it has sailed the entire distance (3/5). It is still 450 kilometers away from Hankou. How many kilometers is the waterway from Shanghai to Hankou?
一艘轮船从上海开往汉口，已经航行了全程的(3/5)，离汉口还有450千米，上海到汉口的水路有多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">450 / (2/5)</gadget>
<output>1_125</output>

<result>1_125</result>