A and B jointly produce 120 parts and complete the task in (4/5) hours. A produces 80 per hour, how many per hour does B produce?
甲乙两人共同生产120个零件，(4/5)小时完成任务．甲每小时生产80个，乙每小时生产多少个？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 / (4/5)</gadget>
<output>150</output>

<gadget id="calculator">150 - 80</gadget>
<output>70</output>

<result>70</result>