A car travels 60 kilometers per hour, which is equivalent to (2/3) the flying speed of a swallow. How many kilometers does the swallow fly per hour?
一辆汽车每小时行60千米，相当于燕子飞行速度的(2/3)．燕子每小时飞行多少千米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">60 / (2/3)</gadget>
<output>90</output>

<result>90</result>