The distance between A and B is 504 kilometers. A car travels from A to B in 6 hours (3/4). At this speed, how many hours will it take to reach B? (Solve with ratio)
甲、乙两地相距504千米，一辆汽车从甲地开往乙地，6小时行了全程的(3/4)，以这样的速度，还需几小时到达乙地？(用比例解)
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">6 - (9/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) / (3/4)</gadget>
<output>2</output>

<result>2</result>