A passenger car and a truck drive from station A to station B at the same time. It takes 6 hours for the bus to complete the journey. The speed of the truck is 1/3 faster than that of the passenger car. How many hours earlier will the truck arrive at station B than the passenger car?
一辆客车和一辆货车同时从甲站开往乙站，客车行完全程需要6小时，货车的速度比客车快(1/3)，货车将比客车提前多少小时到达乙站．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(1/6) * (4/3)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 / (2/9)</gadget>
<output>9/2 = around 4.5</output>

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

<result>3/2 = around 1.5</result>