A train travels from A to B, which is 600 kilometers away, and travels 150 kilometers in 3 hours. According to this calculation, how many hours will it take for the train to reach B?
一列火车从甲地开往相距600千米的乙地，3小时行了150千米，照这样计算，这列火车还要行多少小时才能到达乙地？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">600 / 50</gadget>
<output>12</output>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<result>9</result>