Answer:
Noelle will need to walk at a rate of 3 miles per hour for 2/3 of an hour to finish traveling the 4 miles.
Step-by-step explanation:
This will be a two part problem.
Noelle wants to travel 4 miles in total.
If she wants to run for 20 minutes at a rate of 6 miles/hour, we need to convert 20 minutes into terms of hours
20 minutes * 1 hour/60 minutes = 1/3 of an hour
let's find the distance she has traveled by running then using
d = r*t
where d is our distance in miles,
r is our speed in miles/hour, and
t is the time taken in hours
if r = 6 miles/hour and
t = 1/3 hours
we have
d = (6 miles/hour) * (1/3 hours)
hours will cancel out, leaving us with
d = 2 miles
If Noelle has covered 2 miles by running, how many minutes then will she need to walk at a rate of 3 miles per hour to cover the remaining two miles?
d = 2 miles
r = 3 miles/hour
2 miles = (3 miles/hour) *t divide both sides by 3 miles/hour
miles will cancel out, leaving us with
2/3 hours = t
Therefore, Noelle will need to walk at a rate of 3 miles per hour for 2/3 of an hour to finish traveling the 4 miles.