Answer:
First, you need to remember the relation:
speed = distance/time
We know that she needs to arrive at her friend's wedding at 3:00.
We also know that the total distance between her house and the wedding is 97 miles.
Now we need to find the total time that she needs to arrive at the wedding, so we can estimate at which hour she needs to start the travel.
The first 20 miles are driven att 30 miles per hour.
Then:
distance = 20mi
speed = 30mi/h
30mi/h = 20mi/T
T = 20mi/(30mi/h) = 0.67 hours.
The next 12 miles are driven at 45 mi/h
then:
45mi/h = 12mi/T
T = (12mi/(45mi/h)) = 0.27 hours
And the remainder distance is traveled at 65 mi/h
First, at this point she did travel 20mi + 12mi = 32mi
And we know that the total distance was 97mi, then the remaining distance is:
97mi - 32mi = 65mi
Then now she travels 65 miles at the speed of 65mi/h
then:
65mi/h = 65mi/(T)
T = (65mi)/(65mi/h) = 1 hour
Then the total time needed for the travel is:
Time = 0.67 hours + 0.27 hours + 1 hour = 1.94 hours.
knowing that 1 hour = 60 min
0.94 hours = 0.94*(60 min) = 56.4 min
time = 1 hour and 56.4 min
Meaning that she needs to leave her house around two hours before 3:00
So she would need to leave her house at around 1:03