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.

A Rate-Work Problem for TJ Test Prep. Target Time. 30-40 seconds.

Sela and Neela are painter robots. Sela takes 48 Hrs to paint your house. If Sela and Neela (a trainee) work together, they can paint your house in 40 Hrs. Working alone, Neela will take how many Hrs to paint your house?


Note: Ark, thank you for pointing out the typo in the first version of of the problem. I appreciate all corrections.