For a storybook, Xiaoxin reads 45 pages per hour, and it takes 6 hours to finish it. If he reads 50 pages per hour, how many hours does it take to finish it? (Solve with ratio)
一本故事书，小新每小时看45页，需6小时才能看完，若每小时看50页，需几小时能看完？(用比例解)
<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">270 / 50</gadget>
<output>27/5 = around 5.4</output>

<result>27/5 = around 5.4</result>