Answer:
[tex]120 \frac{4}{5}[/tex] or 120.8 miles per hour
Step-by-step explanation:
We first convert the distance into an improper fraction to facilitate calculation.
[tex]90 \frac{3}{5} = \frac{90\times 5 + 3}{5} = \frac{453}{5}[/tex]
Average speed
= distance/time
= [tex]\frac{\frac{453}{5}}{\frac{3}{4}}[/tex]miles per hour
= [tex]\frac{453}{5} \times \frac{4}{3}[/tex] miles per hour
= [tex]\frac{604}{5}[/tex] miles per hour
= [tex]120 \frac{4}{5}[/tex] miles per hour or 120.8 miles per hour
