Computer a can carry out an engineering analysis in 6 hours, but computer b can do the same job in 4 hours. how long does it take to complete the job if both computers work together?

Computer A can carry out analysis in 6 hours. That means in an hour, computer A does  of the job.

Computer B can carry out analysis in 4 hours. That means in an hour, computer B does  of the job.

If both computers work together, in an hour they do:



In an hour, they do  of the job.

To finish the job, they need  hours.
hours
= 2.4 hours
= 2 hours + 0.4 hour
= 2 hours + 0.4 × 60 minutes
= 2 hours 24 minutes

They finish analysing in 2 hours 24 minutes

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