# X and Y, two computer engineers, built identical websites

X and Y, two computer engineers, built identical websites at different constant rates. X, working alone for 7 hours, built some of the website; then Y, working alone for 6 hours, built the rest of the website. How many hours would it have taken X, working alone, to build all of the website?

1. X built one part 15 minutes
2. X built four times as many parts in 7 hours as Y built in 6 hours

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

Statement 2 provides us with an equation relating the two rates: 7X = 4(6Y).

We can simplify this formula to get one rate in terms of the other. The first step is to calculate the expression on the right-hand side: 7X = 24Y.

Now divide both sides by 24: 7/24 X=Y.

Statement 2 is sufficient on its own.

Founded in 2009, 2minuteGMAT guarantees that you will improve your GMAT score by 50 points or your money back. We send you a unique email every day for 3 months with 10 GMAT Questions of the Day (5 Math and 5 Verbal), a daily blurb about top business schools in the country, and advice from experts on how to improve your GMAT score. Visit the 2minuteGMAT blog for updates and GMAT tips.

1. Complete GMAT RC Questions in less than 1 minute and 50 seconds
3. Take Notes Effectively
4. Collect and Interpret Facts
5. Speed up Summary Creation
6. Remember Information
7. Question the Author

12. Learn to Answer GMAT organization of passage Question
13. Learn to identify the style/tone or attitude of the author

Mastering GMAT Critical Reasoning

After you read F1GMAT’s Mastering GMAT Critical Reasoning Guide, you will learn:

How to overcome flawed thinking in GMAT Critical Reasoning?

How to spot Inconsistencies in Arguments

How to eliminate out of scope answer choices using Necessary and Sufficient Conditions

How to Paraphrase GMAT Critical Reasoning Question

How to Answer Assumption Question Type

How to Answer Conclusion Question Type

How to Answer Inference Question Type

How to Answer Strengthen Question Type

How to Answer Weaken Question Type

How to Answer bold-faced and Summary Question Types

How to Answer Parallel Reasoning Questions

How to Answer the Fill in the Blanks Question

Get F1GMAT's Newsletters (Best in the Industry)

• Ranking Analysis
• Post-MBA Salary Trends
• Post-MBA Job Function & Industry Analysis
• Post-MBA City Review
• MBA Application Essay Tips
• School Specific Essay Tips
• GMAT Preparation Tips
• School Specific Interview Tips
• Funding Guidance and
• Special Consultation Service (only for Subscribers)