The speed of a butterfly is 7.5 km/h, and the speed of a bee is 2.4 times its flying speed. What is the speed of a bee in km/h?
一只蝴蝶的速度是7.5千米/时，蜜蜂的速度是它飞行速度的2.4倍，蜜蜂的速度是多少千米/时？
<gadget id="calculator">7.5 * 2.4</gadget>
<output>18</output>

<result>18</result>