It takes 6 hours for car A to complete the journey, and the speed of car B is 20% slower than that of car A. How many hours will it take longer for car B to complete the journey than car A?
甲车行完全程要6小时，乙车速度比甲车慢20%，乙车行完全程比甲车多用几小时？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/6) * (4/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / (2/15)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) - 6</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>