The roads from A to B are all uphill or downhill, and the distance of the uphill road is twice that of the downhill road. A car travels from A to B, the speed of the uphill road is half that of the downhill road, and it takes 1.5 hours to reach B. How many hours will it take for the car to return from point B to point A at the original speed?
从甲地到乙地的路全是上坡路或下坡路，其中上坡路的路程是下坡路的2倍．汽车从甲地到乙地，行上坡路的速度是下坡路的一半，1.5小时到达乙地．汽车从乙地返回甲地，按原来的速度，要行几小时？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">1.5 / 5</gadget>
<output>0.3</output>

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

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

<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

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

<result>1.2</result>