On the Reading Comprehension section of the OAT, you'll have 60 minutes to do three passages, each of which has 16-17 questions for a total of 50 questions. This section tests your ability to find the main idea, process information, and read and understand dense passages.
Allow yourself approximately 20 minutes per passage. It may seem like a lot of time, but it goes by very quickly. Do the easiest passages first. Within a section, if you're deciding which passage to do based on time alone, do the one with the most questions. That way you maximize your reading efficiency. However keep in mind that some passages are longer than others. On average, give yourself about 8 to 9 minutes to read and then 10 to 11 minutes for the questions.