A butterfly flies 2 kilometers in 0.4 hours, and the speed of a bee is 2.4 times its flying speed. How many kilometers does a bee fly per hour?
一只是蝴蝶0.4小时飞行2千米，蜜蜂的速度是它飞行速度的2.4倍，蜜蜂每小时飞行多少千米？
<gadget id="calculator">2 / 0.4</gadget>
<output>5</output>

<gadget id="calculator">5 * 2.4</gadget>
<output>12</output>

<result>12</result>