Uncle Zhang traveled 25% of the journey from Beijing to Shanghai in 3 hours. How many hours will it take to complete the journey?
张大爷从北京到上海，3小时行了全程的25%，行完全程还要多少小时？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / (1/4)</gadget>
<output>12</output>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<result>9</result>