There are two gears meshing with each other on the machine. The driving wheel has 100 teeth and rotates 90 times per minute. The driven wheel has 25 teeth, how many revolutions per minute?
机器上有两个互相咬合的齿轮，主动轮有100个齿，每分钟转90圈．从动轮有25个齿，每分钟转多少圈？
<gadget id="calculator">90 * 100</gadget>
<output>9_000</output>

<gadget id="calculator">9_000 / 25</gadget>
<output>360</output>

<result>360</result>