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Answer» AVG SPEED= TOTAL distance/total time
80 =  \frac{90}{x}  \\ x =  \frac{9}{8}
now
avg \: speed =  \frac{110}{ 2 - \frac{9}{8} }  \\  =  \frac{110 \times 8}{7}  \\  = 125.9
=126


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