The distance between A and B is 456 kilometers. Two trucks, A and B, drive from the two places at the same time. After meeting for 3 hours, it is known that car A travels 72 kilometers per hour. How many kilometers per hour does car B travel?
AB两地相距456千米，甲乙两货车同时从两地相对开出，经过3小时相遇、已知甲车每小时行72千米，乙车每小时行多少千米？
<gadget id="calculator">456 / 3</gadget>
<output>152</output>

<gadget id="calculator">152 - 72</gadget>
<output>80</output>

<result>80</result>