A, B, and C run from A to B at the same time. When A runs to B, B is still 20 meters away from B, and C is still 40 meters away from B. When B runs to B, C is still 24 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20米，丙离B还有40米；当乙跑到B时，丙离B还有24米．A、B相距多少米？
<gadget id="calculator">20 * 24</gadget>
<output>480</output>

<gadget id="calculator">20 * 40</gadget>
<output>800</output>

<gadget id="calculator">800 - 800</gadget>
<output>0</output>

<gadget id="calculator">480 + 0</gadget>
<output>480</output>

<gadget id="calculator">20 - 40</gadget>
<output>-20</output>

<gadget id="calculator">24 + (-20)</gadget>
<output>4</output>

<gadget id="calculator">480 / 4</gadget>
<output>120</output>

<result>120</result>