A car travels 80 kilometers per hour. It starts at 9:00 a.m. and arrives at its destination at 21:00 a.m. How many kilometers did you travel in total?
一辆汽车每小时行80千米，它从上午9时出发，21时到达目的地．一共行了多少千米？
<gadget id="calculator">21 - 9</gadget>
<output>12</output>

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

<result>960</result>