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Total distance = 16m + 16m = 32m
Total time = 4s + 2s = 6s

Average speed = Total distance / Total time
                       = 32/6
                       = 5.33 m/s

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Total Distance= 16m+16m =32m
Total Time=4s+2s =6second
Average speed= Total distance/Total Time
                        = 32m/6s
Ans.             5.33m/s