TJ Prep Problems

TJ test prep practice problems  for our students and readers. The problems provide a very small sampling of what Optimal TJ Prep students work with.

TJ Prep - A Medium Speed Distannce Problem. Target Time 45-50 seconds.

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?