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Average Speed = Total Distance/Total Time

Total Distance = x + x = 2x

Total Time = x/10 + x/8 = x (1/10 + 1/8) = x ( 4 + 5)/40 = 9x/40

Speed = 2x/(9x/40) = (2x * 40)/9x = 80x/9x = 80/9 = 8.9

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