Pigeons fly very fast. In one flight, it flies 120 kilometers with the wind, which is equivalent to 4 times of its headwind speed. How many kilometers per hour can a pigeon fly against the wind?
鸽子的飞行速很快．在一次飞行中，顺风时飞行120千米，相当于它逆风飞行速度的4倍．鸽子逆风每小时能飞行多少千米？
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<result>30</result>