SOLUTION: Please help me solve this word problem. The family trip to Grandma's consisted of both a train ride and a car ride. The average speed of the train ride was 79 miles per hour, and

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Question 778438: Please help me solve this word problem.
The family trip to Grandma's consisted of both a train ride and a car ride. The average speed of the train ride was 79 miles per hour, and the average speed of the car ride was 64 miles per hour. The entire trip lasted 9 hours.
Let x be the number of hours the train ride lasted. Write an expression for the total distance of the trip, in miles.
Found 2 solutions by unlockmath, NeedTrigHelp:
Answer by unlockmath(1688) About Me  (Show Source):
You can put this solution on YOUR website!
Hello,
Here it is:
79x + 64(9-x)
Make sense?
RJ
www.math-unlock.com

Answer by NeedTrigHelp(2) About Me  (Show Source):
You can put this solution on YOUR website!
The family trip to Grandma's consisted of both a train ride and a car ride. The average speed of the train ride was 79 miles per hour, and the average speed of the car ride was 64 miles per hour. The entire trip lasted 9 hours. Let x be the number of hours the train ride lasted. Write an expression for the total distance of the trip, in miles.


Grandma's trip answer given by tutor unlockmath 1688 can be "simplified" further.
79x + 64 (9-x)


Simplify further to
15x + 576

To verify, plug 79x + 64 (9-x) into mathway.com solver and choose simplify.
Resultant answer will be
15x + 576