train travels from Rui'an to Shanghai, the whole journey (3/5), 450 kilometers away from Rui'an, how many kilometers is the whole journey from Rui'an to Shanghai?
一列火车从瑞安开往上海，行了全程的(3/5)，离瑞安450千米，瑞安到上海全程多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">450 / (3/5)</gadget>
<output>750</output>

<result>750</result>