A truck travels 70 kilometers per hour, which is equivalent to (7/8) the speed of a passenger car. Now two cars drive from A and B oppositely at the same time, and finally meet at a distance of 50 kilometers from the midpoint. How many kilometers are there between A and B?
一辆货车每小时行70千米，相当于客车速度的(7/8)．现两车同时从甲、乙两地相对开出，结果在距中点50千米处相遇．甲乙两地相距多少千米？
<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

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

<gadget id="calculator">(8/15) - (1/2)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">50 / (1/30)</gadget>
<output>1_500</output>

<result>1_500</result>