Cars A and B are traveling toward each other at the same time from two places 272 kilometers apart. After 3 hours, the distance between the two cars is still 17 kilometers. Car A travels 45 kilometers per hour. How many kilometers per hour does Car B travel?
甲、乙两车从相距272千米的两地同时相向而行，3小时后两车还相距17千米，甲车每小时行45千米，乙车每小时行多少千米？
<gadget id="calculator">272 - 17</gadget>
<output>255</output>

<gadget id="calculator">255 / 3</gadget>
<output>85</output>

<gadget id="calculator">85 - 45</gadget>
<output>40</output>

<result>40</result>