A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant
Posted: Mon Jul 18, 2022 5:45 am
A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?