Trip to Grandma's

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 66 miles per hour, and the average speed of the car ride was 61 miles per hour. The entire trip lasted 10 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

Let x = hrs on train and then 10-x = hrs in the car.

The entire trip was 66x + 61(10-x).

If we knew the total distance involved, we could determine how lon each part of the trip lasted.