One person produces 10 parts per hour. According to this calculation, how many parts can be produced by 3 people in 3 hours.
一人一小时生产10个零件．照这样计算，3人3小时能生产多少个零件．
<gadget id="calculator">10 * 3 * 3</gadget>
<output>90</output>

<result>90</result>