A and B are walking towards each other from AB at the same time. After they meet, they continue to move forward. A takes 4 hours to reach point B, and B takes 6.25 hours to reach point A. It is known that A travels 20 kilometers more than B per hour. How many kilometers apart are the places?
甲乙两人分别从AB同时相向而行，二人相遇后继续前进，甲经过4小时到达B地，乙经过6.25小时到达A地，已知甲每小时比乙多行20千米，求AB两地的相距多少千米？
<gadget id="calculator">2.5 * 20</gadget>
<output>50</output>

<gadget id="calculator">2.5 - 2</gadget>
<output>0.5</output>

<gadget id="calculator">50 / 0.5</gadget>
<output>100</output>

<gadget id="calculator">4 * 100</gadget>
<output>400</output>

<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">6.25 * 80</gadget>
<output>500</output>

<gadget id="calculator">400 + 500</gadget>
<output>900</output>

<result>900</result>