A train travels from Fuzhou to Shanghai and travels 360 kilometers in 3 hours, which happens to cover the entire distance (2/5). How many hours will it take to complete the journey?
一列火车从福州开往上海，3小时行了360千米，正好行了全程的(2/5)，行完全程还要几小时？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / (2/5)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) - 3</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>