SOLUTION: If at time 3 hours, a car has traveled 145 miles, and at time 7 hours, the car has traveled 357 miles, what is the car's average rate of change over the given time interval? Includ

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: If at time 3 hours, a car has traveled 145 miles, and at time 7 hours, the car has traveled 357 miles, what is the car's average rate of change over the given time interval? Includ      Log On

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Question 1061640: If at time 3 hours, a car has traveled 145 miles, and at time 7 hours, the car has traveled 357 miles, what is the car's average rate of change over the given time interval? Include units in your answer.
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The question asks for the speed during the time interval.

%28%28357-145%29miles%29%2F%28%287-3%29hours%29

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
If at time 3 hours, a car has traveled 145 miles, and at time 7 hours, the car has traveled 357 miles,
what is the car's average rate highlight%28cross%28of_change%29%29 over the given time interval? Include units in your answer.
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It is not clear from the post, to which time interval does the question relate.


Does it relates to the 3-hour interval? - Then the average rate is 145%2F3 miles per hour.

Does it relates to the 7-hour interval? - Then the average rate is 357%2F7 miles per hour.

If it relates to the entire trip of 3 + 7 hours, then the average rate is %28145%2B357%29%2F%283%2B10%29 miles per hour.

I left it to you to make calculations.

By the way, the words "car's average rate of change" tell a lot about you.
The matter is that such combination of words is not applicable in this context.
The correct term is "car's average rate".

Watch your terminology !!