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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
Computer B can carry out analysis in 4 hours. That means in an hour, computer B does
If both computers work together, in an hour they do:
In an hour, they do
To finish the job, they need
= 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