train travels 312 kilometers in 4 hours, and it takes 12 hours to travel from Dezhou to Shenyang. How many kilometers is it from Dezhou to Shenyang?
一列火车4小时行驶312千米，从德州到沈阳需要行驶12小时，从德州到沈阳有多少千米？
<gadget id="calculator">312 / 4</gadget>
<output>78</output>

<gadget id="calculator">78 * 12</gadget>
<output>936</output>

<result>936</result>