SOLUTION: i'm stuck with this homework...i never learn this in 6th grade but my 8th grade teacher said that we did. I know we never did this maybe some other schools did except my school...c

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Question 344656: i'm stuck with this homework...i never learn this in 6th grade but my 8th grade teacher said that we did. I know we never did this maybe some other schools did except my school...can you guys help me how to solve this problem.It's Distance=rate*time i think..

Andy's average driving speed for a 4-hour trip was 45 miles per hour. During the first 3 hours he drove 40 miles per hour. What was his average speed for the last hour of his trip?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate*Time=Distance
.
.
R%2At=D
45%2A4=D
D=180miles
He traveled a total of 180 miles in 4 hours.
.
.
During the first 3 hours, he traveled,
D=40%2A3=120miles
.
.
So for the last hour, he covered *180-120=)60 miles.
R=D%2Ft=60%2F1=60mph
His rate during the last hour was 60 mph.