passenger car and a truck depart from the two cities of A and B at the same time. It takes 10 hours for the bus to complete the journey, and 12 hours for the truck to complete the journey. After 5 hours, the distance between the two cities is still 50 kilometers. How far is the distance between A and B? rice.
客车和货车同时从甲、乙两城相对开出，客车行完全程需要10小时，货车行完全程需要12小时，两车行5小时后还相距50千米，甲、乙两城相距多少千米．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/10) + (1/12)</gadget>
<output>11/60 = around 0.183333</output>

<gadget id="calculator">(11/60) * 5</gadget>
<output>11/12 = around 0.916667</output>

<gadget id="calculator">1 - (11/12)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">50 / (1/12)</gadget>
<output>600</output>

<result>600</result>