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Mayaka started work on his shamba at 7.30 a.m. After working for 3 h 15 minutes, he rested for half an hour. He then worked until 1.00 p.m. After a one- hour lunch break he worked upto 3.45p.m. For how long did he work on the shamba that day?
A. 6h 45 min
B. 7h 15min
C. 8h 15min
D. 8h 45min