Answer:
9 2/3 miles /hour
Explanation:
Rate can also be referred to as speed.
The formula for Rate or Speed = Distance(Miles) /Time(hours)
Rhianna's distance = 4 5/6 miles
Rhianna's Time = 1/2 hour
Rate = 4 5/6 miles/ 1/2 hour
Rate = 29/6 miles ÷ 1/2 hour
Rate = 29/6 × 2/1
Rate = 29/3 miles/hour
Rate = 9 2/3 miles /hour
Rhianna's rate = 9 2/3 miles /hour