Two trains, A and B, leave at the same time from two places 500 kilometers apart. After 4 hours, they do not meet and the distance is 20 kilometers. If it is known that train B travels 55 kilometers per hour, how many kilometers per hour does train A travel? ．
甲、乙两列火车同时从相距500千米的两地相对开出，4小时后没有相遇还相距20千米，已知乙车每小时行55千米，则甲车每小时行多少千米．
<gadget id="calculator">55 * 4</gadget>
<output>220</output>

<gadget id="calculator">500 - 20 - 220</gadget>
<output>260</output>

<gadget id="calculator">260 / 4</gadget>
<output>65</output>

<result>65</result>