A train travels 320 km in 4 hours. At this speed, how many hours will it take to travel 960 kilometers?
一列火车4小时行驶320千米．照这样的速度，要行驶960千米，需要几小时？
<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">960 / 80</gadget>
<output>12</output>

<result>12</result>