(Scenario question) During the tsunami relief period, two vehicles, A and B, transported a batch of relief supplies to the disaster area. Vehicle A transported 5 times, and vehicle B transported 8 times. Vehicle A transported 4 more boxes than B each time, and the task was completed. When car A transports 13 boxes less than car B, how many boxes does car B transport each time?
(情景题)在海啸救助时期，甲、乙两辆汽车为灾区运送一批救援物资，甲车运了5次，乙车运了8次，甲车每次比乙多运4箱，完成任务时，甲车比乙车少运13箱，乙车每次运多少箱？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 13</gadget>
<output>33</output>

<gadget id="calculator">33 / 3</gadget>
<output>11</output>

<result>11</result>