SOLUTION: 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 54

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 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 54       Log On


   

Question 1051044: 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 54 miles per hour. the entire trip lasted 7 hours. ley x be the number of hours the train ride lasted. write an expression for the total distance of the trip, in miles.
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
              SPEED       TIME       DISTANCE
TRAIN          79           x           79*(x)
CAR            54          7-x         54(7-x)
TOTAL                       7         79x+54(7-x)