Cars A and B drive towards each other from two places 450 kilometers apart and meet each other in 4.5 hours. It is known that car A travels 54 kilometers per hour, how many kilometers per hour does car B travel?
甲、乙两车从相距450千米的两地相向开出，4.5小时相遇．已知甲车每小时行54千米，乙车每小时行多少千米？
<gadget id="calculator">450 / 4.5</gadget>
<output>100</output>

<gadget id="calculator">100 - 54</gadget>
<output>46</output>

<result>46</result>