Your mother takes you to your grandparents house for dinner she drives 60 minutes at a constant speed of 40 miles per hour she reaches the highway and quickly speeds up and drives for another 30 minut

Your mother takes you to your grandparents house for dinner she drives 60 minutes at a constant speed of 40 miles per hour she reaches the highway and quickly speeds up and drives for another 30 minutes at constant speed of 70 miles per hour