Cars A and B start from places a and b at the same time and go towards each other. When car A travels 20 kilometers longer than the full distance (3/8) and meets car B, it is known that the speed ratio of cars A and B is 2: 3. Find the distance between a and b in kilometers?
甲乙两车同时从a、b两地出发相向而行，当甲车行的路程是全程的(3/8)多20千米时与乙车相遇，已知甲乙两车的速度比是2：3，求a、b两地相距多少千米？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(2/5) - (3/8)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">20 / (1/40)</gadget>
<output>800</output>

<result>800</result>