Asked by Megan

a person can copy the final exam in 28 minutes using a new copy machine. using an old copy machine, it takes 70 minutes. if both machines are used, how long will it take to complete the job

12 years ago

Answered by Steve

1/b = 1/28 + 1/70
b = ?

12 years ago

Answered by lu

2.5

8 years ago

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