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Naina go to bed (sleep) at 9:30 in night and wakeup at 6:20 in the morning then how long she sleep in total ?

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Time of sleeping upto 12.00 midnight.

Therefore 2 hours 30 minutes.

Now 12.00 midnight to 6:20 morning means 6 hours 20 minutes she sleep.

Therefore total time

Therefore Naina sleep 8 hours 50 minutes in total.

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