A passenger car and a truck leave opposite directions at the same time from places A and B. It takes 10 hours for the bus to complete the journey, and 42 kilometers per hour for the truck. After 3 hours, the sum of the distance traveled by the two vehicles is equal to the remaining distance. A and B How many kilometers are the distance between the two places?
客车和货车同时从甲、乙两地相向开出，客车行完全程需10小时，货车每小时行42千米，3小时后，两车行驶的路程之和与剩下路程相等，甲、乙两地相距多少千米？
<gadget id="calculator">42 * 3</gadget>
<output>126</output>

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

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">126 / (1/5)</gadget>
<output>630</output>

<result>630</result>