Person A and Person B ride bicycles starting from point A at the same time and going in the same direction. A is 3 kilometers faster than B every hour. A passes through point B 20 minutes earlier than B. When B arrives at point B, the distance between the two is 5 kilometers. How many kilometers are there between A and B?
甲乙两人骑车从A地同时出发同向而行．甲每小时比乙快3千米，甲比乙早20分经过途中B地，当乙到达B地时，两人相距5千米，AB两地多少千米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 3</gadget>
<output>1</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 / (1/3)</gadget>
<output>12</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">12 * (5/3)</gadget>
<output>20</output>

<result>20</result>