Working together, Pipe A and Pipe B can fill a tank in 6 hours. If Pipe A alone can fill the tank in 10 hours, how many hours would it take Pipe B alone to fill the tank?

A 12 hours

B 15 hours

C 16 hours

D 20 hours

✓ Correct Answer: Option B

Let the rates be 1/A and 1/B. Together, their rate is 1/6. We know 1/A = 1/10. So, 1/10 + 1/B = 1/6. Subtract 1/10 from both sides: 1/B = 1/6 - 1/10 = 5/30 - 3/30 = 2/30 = 1/15. Thus, B takes 15 hours.

💡 Why is B) the correct answer?

The correct answer to the question "Working together, Pipe A and Pipe B can fill a tank in 6 hours. If Pipe A alone can fill the tank in 10 hours, how many hours would it take Pipe B alone to fill the tank?" is Option B: 15 hours.

The other options — A) 12 hours, C) 16 hours, D) 20 hours — are incorrect for this GMAT Exam Prep question. As explained above: Let the rates be 1/A and 1/B. Together, their rate is 1/6. We know 1/A = 1/10. So, 1/10 + 1/B = 1/6. Subtract 1/10 from both sides: 1/B = 1/6 - 1/10 = 5/30 - 3/30 = 2/30 = 1/15. Thus, B takes 15 hour…

📚 About This GMAT Exam Prep Practice Question

This 3-level GMAT Exam Prep question from the Quantitative Reasoning topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free GMAT Exam Prep practice test or use flashcards for spaced repetition review.

Practice GMAT Exam Prep Quizzes → Browse All Questions Study Flashcards

Working together, Pipe A and Pipe B can fill a tank in 6 hours. If Pipe A alone can fill the tank in 10 hours, how many hours would it take Pipe B alone to fill the tank?

✓ Correct Answer: Option B

📚 About This GMAT Exam Prep Practice Question

Related GMAT Exam Prep Questions