A truck delivers goods from place A to place B, and travels the whole journey (3/5) in 3 hours. What fraction of the journey is made per hour on average? At this speed, how many hours will it take to complete the journey?
一辆货车从甲地送货到乙地，3小时行了全程的(3/5)，平均每小时行全程的几分之几？照这样的速度，行完全程还要几小时？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<result>2</result>