The road from A to B is all uphill and downhill, and the distance of the uphill is twice that of the downhill. A car travels from A to B. The speed of the uphill road is half that of the downhill road. It takes 1.5 hours to arrive. How many hours does it take to return from B to A?
从甲地到乙地的路全是上坡路和下坡路，其中上坡路的路程是下坡路的2倍．一辆汽车从甲地到乙地，行上坡路的速度是下坡路的一半，行1.5h到达，从乙地返回甲地，要行多少h？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1.5 * (4/5)</gadget>
<output>1.2</output>

<gadget id="calculator">1.5 - 1.2</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 * 2</gadget>
<output>0.6</output>

<gadget id="calculator">(4/5) / 2</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1.5 * (2/5)</gadget>
<output>0.6</output>

<gadget id="calculator">0.6 + 0.6</gadget>
<output>1.2</output>

<result>1.2</result>