A car drives from place A to place B. The distance between place A and place B is 405 kilometers. After driving 180 kilometers in the first 4 hours, how many hours will it take for the remaining distance?
一辆汽车从甲地开往乙地，甲乙两地相距405千米，头4小时行驶了180千米，剩下的路程还要行多少小时？
<gadget id="calculator">405 - 180</gadget>
<output>225</output>

<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<gadget id="calculator">225 / 45</gadget>
<output>5</output>

<result>5</result>