Both the bus and the car depart from point A to point B. The speed ratio of the bus and the car is 4:5. The bus starts 15 minutes earlier than the car, but stays at the midpoint c of AB for 7 minutes, and the car continues to drive to At point B, the last bus arrives at point B 2 minutes later than the car. How many minutes does it take for a car to overtake a bus?
大巴和轿车都从A地出发驶向B地，大巴和轿车速度之比为4：5，大巴比轿车早出发15分钟，但在AB中点c处停留了7分钟，轿车则不断的驶向B地，最后大巴比轿车晚2分钟到达B地．轿车出发多少分钟超过大巴？
<gadget id="calculator">15 - 7</gadget>
<output>8</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<result>32</result>