The road between A and B is 525 kilometers long. A car travels 225 kilometers from A to B in the first three hours. At this speed, how many hours will it take to reach B?
甲、乙两地之间的公路长525千米，一辆汽车从甲地开往乙地，前三小时行225千米．照这样的速度，还需要几小时才能到达乙地？
<gadget id="calculator">225 / 3</gadget>
<output>75</output>

<gadget id="calculator">525 / 75</gadget>
<output>7</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<result>4</result>