A pair of meshing gears, the speed ratio of the driving wheel and the driven wheel is 3:5, the driving wheel rotates 180 revolutions per minute, how many revolutions per minute does the driven wheel rotate?
一对咬合的齿轮，主动轮和从动轮转速的比是3：5，主动轮每分钟转180转，从动轮每分钟转多少转？
<gadget id="calculator">180 * 5</gadget>
<output>900</output>

<gadget id="calculator">900 / 3</gadget>
<output>300</output>

<result>300</result>