A passenger car and a truck drive from station A to station B at the same time. It takes 6.8 hours for the bus to complete the journey, and the speed of the truck is faster than that of the passenger car (2/15). How many hours will the truck arrive at Station B earlier than the bus?
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6.8小时，货车的速度比客车快(2/15)．货车将比客车提前几小时到达乙站？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 + (2/15)</gadget>
<output>17/15 = around 1.133333</output>

<gadget id="calculator">6.8 / (17/15)</gadget>
<output>6</output>

<gadget id="calculator">6.8 - 6</gadget>
<output>0.8</output>

<result>0.8</result>