The distance between A and B is 405 kilometers. A car travels 180 kilometers from A to B in 4 hours. At this speed, how many hours will it take the car to travel from A to B?
甲、乙两地相距405千米，一辆汽车从甲地开往乙地，4小时行驶了180千米．照这样的速度，这辆汽车从甲到往乙地一共要行几小时？
<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<gadget id="calculator">405 / 45</gadget>
<output>9</output>

<result>9</result>