The distance between the east and west cities is 280 kilometers. Cars A and B drive separately from the two places and meet each other in 3.5 hours. It is known that car A travels 45.6 kilometers per hour, and how many kilometers per hour does car B travel.
东西两城间的路程280千米，甲乙两车分别从两地对开，3.5小时相遇，已知甲车每小时行45.6千米，乙车每小时行多少千米．
<gadget id="calculator">280 / 3.5</gadget>
<output>80</output>

<gadget id="calculator">80 - 45.6</gadget>
<output>34.4</output>

<result>34.4</result>