The flat road between A and B occupies (1/5). From A to B, the uphill journey is (2/3) of the downhill journey. A car travels from A to B for 2 hours. It is known that the speed of the car going up the hill is 20% slower than that of the flat road, and the speed of going down the hill is 20% faster than that of the flat road. According to this calculation, how long does it take for the car to travel from point B to point A?
甲、乙两地间平路占(1/5)，由甲地去往乙地，上山路程是下山路程的(2/3)，一辆汽车从甲地到乙地共行2小时，已知这辆车上山速度比平路慢20%，下山速度比平路快20%，照这样计算，汽车从乙地回到甲地要行多长时间？
<gadget id="calculator">5 / 5</gadget>
<output>1</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">5 * (4/5)</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">5 * (6/5)</gadget>
<output>6</output>

<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">1 + 2 + 2</gadget>
<output>5</output>

<gadget id="calculator">8 / 6</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">1 + (4/3) + 3</gadget>
<output>16/3 = around 5.333333</output>

<gadget id="calculator">(16/3) * 0.4</gadget>
<output>2.133333</output>

<result>2.133333</result>