car travels from A to B at 40 km per hour and arrives in 5 hours. If the speed is increased by 25%, how many hours will it arrive?
汽车从甲地到乙地，每小时行40km，5小时到达．如果速度提高25%，几小时到达？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">40 * (5/4)</gadget>
<output>50</output>

<gadget id="calculator">5 / 50</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">40 * (1/10)</gadget>
<output>4</output>

<result>4</result>