On a holiday weekend, if Mrs. Smith drives at an average speed of 20 miles per hour, she will arrive 10 hours late; if she can average a speed of 30 mph, she will arrive 4 hours late. How fast should Mrs. Smith drive so that she will arrive at the scheduled time?
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.