Swift is the fastest bird in long-distance flight. A swift can fly 60 kilometers in 4 hours, and a carrier pigeon can fly 90 kilometers per hour. How many times faster can a carrier pigeon fly than a swift?
雨燕是长距离飞行最快的鸟，一只雨燕4小时可飞行60千米，一只信鸽每小时可飞行90千米，信鸽飞行的速度是雨燕飞行速度的几倍？
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">90 / 15</gadget>
<output>6</output>

<result>6</result>