A car travels the entire distance (4/5) from point A to point B. In the remaining distance, 70% is uphill and the rest is downhill. It is known that the downhill road is 3 kilometers long, how far is the distance between A and B?
一辆汽车从甲地到乙地，行了全程的(4/5)，在剩下的路程中，70%是上坡路，其余是下坡路．已知下坡路长3千米，甲、乙两地相距多远？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/5) * (3/10)</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">3 / (3/50)</gadget>
<output>50</output>

<result>50</result>