Family Trip?

Question

The family trip to Grandma's consisted of both a train ride and a car ride. The average speed of the train ride was 67
miles per hour, and the average speed of the car ride was 52 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.

Answer 1

Chance, since x is the number of hours on the train, than 9-x is the number of hours in the car. Hence, the expression for the total distance traveled is:

 

d=67x+52(9-x)