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mr.wang pianned to make many parts within 2 hours.

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mr.wang pianned to make many parts within 2 hours.
there were still 160 parts left when the machine broke down .the efficiency was 20% lower than before .he had to use 20 more minutes to finish all the work .we can know there are ( ) parts in all.
并能给我写出计算过程,答案应该是哪个?A 320 B 240 C 960 D 800
mr.wang pianned to make many parts within 2 hours.
There are 240 parts in all and Mr.Wang can make 2 parts every minutes.