3 machines produce 210 parts in 2.5 hours, how many parts does each machine produce per hour on average?
3台机器2.5小时生产210个零件，平均每台机器每小时生产多少个零件？
<gadget id="calculator">210 / 2.5 / 3</gadget>
<output>28</output>

<result>28</result>