Senna goes to school at 07.00 and Senna comes home at 13.30 so  how many hours does Senna go to school - 6.30 hours, Sani want eat Sani eat 2 hour she is start at 12.00 where are you done eating?  - 14.00 clock, the group work schedule is at 11.00 and he finishes at 14.00 so how many hours does the group finish - 3 hours,

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