Cars A and B start from AB at the same time and drive toward each other. They meet each other in 6 hours. When they meet, car A travels 54 kilometers longer than car B. It is known that car A travels 70 kilometers per hour, how many kilometers per hour does car B travel?
甲乙两车同时从AB两地出发相向而行，6小时相遇，相遇时甲车比乙车多行54千米，已知甲车每小时行70千米，乙车每小时行多少千米？
<gadget id="calculator">54 / 6</gadget>
<output>9</output>

<gadget id="calculator">70 - 9</gadget>
<output>61</output>

<result>61</result>