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Distance covered in first 6 sec
(4×11)+(1/2×12×11)=11+44=55m
Distance covered in 12 sec
(1/2×3×19)+(4×19)+(1/2×5×19) = 152m
Total distance covered=55+152= 207m
Total Time taken= 18 sec
Avg. speed= Total distance covered/Total Time taken
Avg speed = 207/18 = 11.33 m/s
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