The speed ratio between a passenger car and a truck is 5:4. The truck starts first and drives from Wuzhou to Zhaoping. When the distance from Wuzhou is 16.8 kilometers, the bus starts from Zhaoping to Wuzhou. When the two vehicles meet, the truck travels half of the journey. , how many kilometers is the distance from Zhaoping to Wuzhou?
一辆客车与一辆货车的速度比是5：4，货车先出发从梧州开往昭平，当距离梧州16.8千米时，客车从昭平出发开往梧州，两车相遇时货车行了全程的一半，求昭平至梧州的路程有多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/2) * (4/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">16.8 / (1/10)</gadget>
<output>168</output>

<result>168</result>