Question

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Answer 1

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

Answer 2

hope it helps u.if any query plz let me know.