Two cars set off from the cement factory at the same time to deliver a batch of cement to a construction site 165 kilometers away. Car A arrives 0.8 hours earlier than car B. When car A arrives, car B is still 24 kilometers away from the construction site. How many hours did it take the car to travel the whole way?
两辆汽车同时从水泥厂出发，将一批水泥送到距这里165千米的工地上，甲车比乙车早到0.8小时，当甲车到达时，乙车离工地还有24千米，甲车行驶全程用了多少小时？
<gadget id="calculator">24 / 0.8</gadget>
<output>30</output>

<gadget id="calculator">165 / 30</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">(11/2) - 0.8</gadget>
<output>4.7</output>

<result>4.7</result>