Answer : The bicyclist's average rate of speed in miles per hour is 15 mile/hr.
Step-by-step explanation:
Average rate if speed : It is defined as the ratio total distance to total time.
Formula used :
[tex]\text{Average rate of speed}=\frac{\text{Total distance}}{\text{Total time}}[/tex]
As per question,
Total distance traveled by bicyclist = 4.5 mile + 7.5 mile = 12 mile
Total time taken by bicyclist = (8:48 A.M - 8:00 A.M) = 48 min = 0.8 hr
conversion used : ( 1 hour = 60 minute)
Now put all the given values in the above formula, we get the bicyclist's average rate of speed in miles per hour.
[tex]\text{Average rate of speed}=\frac{\text{Total distance}}{\text{Total time}}[/tex]
[tex]\text{Average rate of speed}=\frac{12mile}{0.8hr}=15mile/hr[/tex]
Therefore, the bicyclist's average rate of speed in miles per hour is 15 mile/hr.
