In GMAT work rate problems in which the amount of work done is 1 job, you can use the fact that rate and time are reciprocals of each other for a single job. Please contact me if you would like me to create a video explaining how to use this idea. Note that this idea, as well as the more general inverse relationship between times and rates, is discussed in the following parts of the Veritas Prep GMAT lesson books:

### Veritas Prep GMAT lesson sections

- Lesson 11: Word Problems Skillbuilder pages 33-34
- Lesson 11: Word Problems Lesson pages 119-122

Here are lists of questions that you can use to practice using the idea that rate and time are reciprocals of each other for a single job, so that you can answer questions more efficiently and increase your GMAT score:

### Official Guide GMAT practice questions

### List of questions on this topic posted on Yin Tutoring:

- Machine R and machine S work at their respective constant rates-
- Source: OG2019 #251
- Difficulty: Sub-600 Level

- Three printing presses, R, S, and T, working together at their…-
- Source: OG2019 #118, OG2019 #113, OG2017 #96
- Difficulty: Sub-600 Level