A, B, and C run from A to B at the same time. When A runs to B, B is still 25 meters away from B, and C is still 40 meters away from B. When B runs to B, C is still 20 meters away from B. rice. What is the distance between A and B?
甲、乙、丙三人同时从A向B跑，当甲跑到B时，乙离B还有25米，丙离B还有40米；当乙跑到B时，丙离B还有20米．A、B两地相距多少米．
<gadget id="calculator">40 - 20</gadget>
<output>20</output>

<gadget id="calculator">20 / 25</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / (1/5)</gadget>
<output>100</output>

<result>100</result>