The passenger car and the truck start from AB at the same time and run towards each other. They meet at a distance of 15 kilometers from the midpoint in 2 hours. Then, the bus travels for 1.5 hours to arrive at B. The truck still has (1/4) of the whole journey. How many kilometers?
客车和货车同时从AB两地出发相向而行，2小时在距离中点15千米处相遇，然后，客车行驶1.5小时到达B地，货车还有全程的(1/4)没走，求全程多少千米？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/7) - (1/2)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">15 / (1/14)</gadget>
<output>210</output>

<result>210</result>