Cars A and B both start from point A and pass through point B to point C. The distance between points A and B is equal to the distance between points B and C. The speed of car B is 80% of the speed of car A. It is known that car B departs 11 minutes earlier than car A, but stays at point B for 7 minutes, while car A drives to point C without stopping. Finally, car B arrives at point C 4 minutes later than car A. Then, how many minutes after the departure of car B, car A will overtake car B.
甲、乙两车都从A地出发经过B地驶往C地，A，B两地的距离等于B，C两地的距离．乙车的速度是甲车速度的80%．已知乙车比甲车早出发11分钟，但在B地停留了7分钟，甲车则不停地驶往C地．最后乙车比甲车迟4分钟到达C地．那么，乙车出发后多少分钟时，甲车就超过乙车．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5)</gadget>
<output>20</output>

<gadget id="calculator">20 + 7</gadget>
<output>27</output>

<result>27</result>