Cars A and B are traveling toward each other from two places at the same time. When car A has traveled 60% of the whole journey, car B has traveled 75% of the whole journey. At this time, the distance between the two cars is 140 kilometers. How many kilometers are the distance between the two places?
甲、乙两车同时从两地相向而行，当甲车行了全程的60%时，乙车正好行了全程的75%，这时两车相距140千米．两地相距多少千米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 1</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">(3/5) + (-1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">140 / (7/20)</gadget>
<output>400</output>

<result>400</result>