Answer:
Shelly's average speed is 5.25 miles per hour.
It take 8 hours to travel 42 miles.
Step-by-step explanation:
Given : Shelly biked 21 miles in 4 hours
To Calculate :
Shelly's average speed in miles per hour.
At that same rate how many hours will it take Shelly to bike 42 miles?
Solution :
We know that shelly traveled distance = 21 miles
She covered 21 miles in hours = 4
Now to calculate her speed we will use formula :
[tex]Speed = \frac{Distance}{Time}[/tex]
[tex]Speed = \frac{21}{4}[/tex]
[tex]Speed =5.25[/tex]
So, Shelly's average speed is 5.25 miles per hour.
Now she traveled 42 miles with same speed (5.25 miles per hour)
Now time taken to cover 42 miles :
[tex]5.25 = \frac{42}{Time}[/tex]
[tex]Time= \frac{42}{5.25}[/tex]
[tex]Time= 8[/tex]
Hence it take 8 hours to travel 42 miles.
