Cars A and B start from two places 396 kilometers apart at the same time and drive toward each other. Car A travels 64 kilometers per hour. On the way, car A stops for 0.5 hours for repairs due to a breakdown, and then continues to drive. As a result, car B meets car A 4 hours after departure. Find the speed of car B.
甲、乙两车同时从相距396千米的两地出发，相向而行．甲车每小时行64千米，途中甲车因故障停车修了0.5小时，然后继续行驶．结果乙车出发4小时后与甲车相遇．求乙车的速度．
<gadget id="calculator">4 - 0.5</gadget>
<output>3.5</output>

<gadget id="calculator">64 * 3.5</gadget>
<output>224</output>

<gadget id="calculator">396 - 224</gadget>
<output>172</output>

<gadget id="calculator">172 / 4</gadget>
<output>43</output>

<result>43</result>