A car travels at a speed of 80 kilometers per hour for (3/4) hours, which is exactly (1/5) of the whole journey. How many hours will it take for this car to reach the end?
一辆汽车以每小时80千米的速度行了(3/4)小时，正好行了全程的(1/5)，这辆汽车行到终点还要几小时？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/5) / (3/4)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 / (4/15)</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">(15/4) - (3/4)</gadget>
<output>3</output>

<result>3</result>