Discussion
Two pipes A & B can fill a tank in 20 minutes and 30 minutes respectively. If both pipes are used together, how long will it take to fill the tank … ?
Answer: A
Rates add when pipes work together:
\[ \frac{1}{20} + \frac{1}{30} = \frac{3 + 2}{60} = \frac{5}{60} = \frac{1}{12} \]
\[ \therefore\; \text{time} = 12 \text{ minutes} \]
The combined time must be shorter than either pipe alone, so anything of 20 minutes or more can be discarded before any arithmetic is done.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development