SOLUTION: Your are traveling to a concert. To arrive on time you plan to travel at an average speed of 45 mph. For the first two hours of the trip you travel at 40 mph. Find the expressio

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Your are traveling to a concert. To arrive on time you plan to travel at an average speed of 45 mph. For the first two hours of the trip you travel at 40 mph. Find the expressio      Log On

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Question 181753This question is from textbook
: Your are traveling to a concert. To arrive on time you plan to travel at an average speed of 45 mph. For the first two hours of the trip you travel at 40 mph. Find the expression for the total time you traveled. Then use the following verbal models to find how many hours you traveled at 55 mph to arrive on time
dist at 40 + dist at 55 = total dist
ave speed *total time = total distThis question is from textbook

Answer by ankor@dixie-net.com(12704) About Me  (Show Source):
You can put this solution on YOUR website!
Your are traveling to a concert. To arrive on time you plan to travel at an
average speed of 45 mph. For the first two hours of the trip you travel at
40 mph.
:
Find the expression for the total time you traveled.
:
Let t = time at 55 mph
Total time = t + 2
:
:
Then use the following verbal models to find how many hours you traveled at 55 mph to arrive on time
:
dist at 40 + dist at 55 = total dist
2(40) + 55t = total dist
;
ave speed *total time = total dist
45(t+2) = total dist
45t + 90 = total dist