and B cooperate to process 2160 parts at the same time, and it takes 8 hours to complete. It is known that A processes 120 parts per hour. How many parts does B process per hour?
甲、乙两人同时合作加工2160个零件，8小时完成，已知甲每小时加工120个零件，问乙每小时加工多少个零件？
<gadget id="calculator">2_160 / 8</gadget>
<output>270</output>

<gadget id="calculator">270 - 120</gadget>
<output>150</output>

<result>150</result>