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There are three independent jobs. They need 10s, 15s and 20s CPU time, respectively, and during their execution each of them spends half a minute

There are three independent jobs. They need 10s, 15s and 20s CPU time, respectively, and during their execution each of them spends half a minute waiting for I/O. Compute the minimal overall runtime of these jobs when they are processed

(a) in a uniprogrammed system

(b) in a multiprogrammed system

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