GRE General TestQuantitative ReasoningEasy
A data scientist is analyzing a large dataset. The dataset contains 15,000 entries. If the processing software can analyze 250 entries per minute, how many hours will it take to process the entire dataset?
- A10 hours
- B1 hour
- C1.5 hours
- D2 hours
Show answer & explanationAnswer & explanation
Correct answer: B. 1 hour
First, calculate the total minutes required by dividing total entries by entries per minute. Then, convert minutes to hours.
Why the other options are wrong
- A. This is a significant overestimation, likely from multiplication instead of division, or a large error in conversion.
- C. This is a common miscalculation, perhaps by dividing by 150 instead of 250, or an error in conversion.
- D. This error might be from incorrect division or conversion (e.g., dividing by 125 entries/min).
Unit Rate and Time Conversion
Unit rate problems involve calculating how much of one quantity corresponds to one unit of another quantity, often requiring conversion between different units of time.
- Unit rate: quantity per unit of time (e.g., entries/minute).
- Conversions: 60 minutes = 1 hour, 24 hours = 1 day.
- Often involves division to find total time, then multiplication/division for conversion.
Memory trick: Rate's Roadtrip: Divide total distance by speed for time, then convert units if needed!