Li Qiang goes from A to B, rides a bicycle first, then changes to a car on the way, and arrives at B in 3 hours; when returning, he takes a car and arrives at B in 1+4/5 hours. Taking a car alone takes less time than riding a bicycle and riding a bicycle, which is equivalent to 3/5 of the time spent riding a bicycle. So how many hours does it take for Li Qiang to ride his bicycle from A to B?
李强从甲地去乙地，去时先骑自行车，途中又换乘汽车，3小时到达乙地；回来时全乘汽车，1+4/5小时就到达乙地．单乘汽车比既骑自行车又乘骑车少用的时间相当于去时骑自行车时间的3/5．那么李强从甲地到乙地全部骑车需要多少小时？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">3 - (9/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(6/5) / (3/5)</gadget>
<output>2</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">1 / (9/5)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(6/5) / (3/5) / (4/9)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>