A truck runs from place A to place B at 6:00 a.m., and travels an average of 45 kilometers per hour. A passenger train travels from place B to place A, on average, 15 kilometers faster than the truck per hour. It is known that the passenger car departs 2 hours later than the truck. At 12:00 noon, the two cars pass by a station on the way at the same time, and then continue to move forward. When the bus arrives at point A, how many kilometers is the truck from point B?
一列货车早晨6时从甲地开往乙地，平均每小时行45千米，一列客车从乙地开往甲地，平均每小时比货车快15千米，已知客车比货车迟发2小时，中午12时两车同时经过途中某站，然后仍继续前进，问当客车到达甲地时，货车离乙地还有多少千米？
<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">45 * 6</gadget>
<output>270</output>

<gadget id="calculator">45 + 15</gadget>
<output>60</output>

<gadget id="calculator">12 - 6 - 2</gadget>
<output>4</output>

<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">270 + 240</gadget>
<output>510</output>

<gadget id="calculator">510 / 60</gadget>
<output>17/2 = around 8.5</output>

<gadget id="calculator">(17/2) + 2</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">45 * (21/2)</gadget>
<output>945/2 = around 472.5</output>

<gadget id="calculator">510 - (945/2)</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>