Exercise: Rates
Discrete Quantitative Questions
For this question, write your answer in the box.- Susan takes a 45-mile trip. She travels the first 15 miles in 40 minutes.
She travels the remaining 30 miles at double the rate at which she traveled
the first 15 miles. What is her average speed for the entire trip in miles
per minute? - Boris ran the first 12 miles of a 24-mile race in 1.8 hours. If his rate for the
entire race was 6 miles per hour, how many hours did it take him to run
the last 12 miles?
A (^53)
B (^95)
C 2
D 2.2
E 6
- Working at a constant rate, a certain hose can fill a pool in 10 minutes.
Working at a different constant rate, another hose can fill the same pool
in 15 minutes. If the two hoses work together but independently to fill the
pool after it is half full, how many minutes will it take the hoses to fill the
pool?
A 3
B 4.5
C 5
D 6
E 12.5
346 PART 4 ■ MATH REVIEW04-GRE-Test-2018_313-462.indd 346 12/05/17 12:04 pm