On a long trip Barbara drove the first 100 miles at 40 MPH, the next 200 miles at 50 MPH and the last 300 miles at 60 MPH. 1) What was Barbara's average speed for the entire trip, and 2) for what fraction of her driving time she drove at 50 MPH?
TJ Prep Problems
TJ Prep practice problems for our students and readers. The problems provide a very small sampling of what Optimal TJ Prep students work with.