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I think both the enzymes are present in liver.
When glucose level ishigh Glucokinase is active coz high Km.
When glucose level ishigh Glucokinase is active coz high Km.
When in postabsorptive state gluckokinase is dormant coz of low affinity(means high km) & Hexokinase has high affinity(low Km) for glucose & functions close to its maximal velocity.