All Categories MCQs
Topic Notes: All Categories
General Description
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1531
A tank is filled by two pipes in 15 min and 24 min respectively, and drained by a third pipe in 31 min. How long to fill the tank if all operate together?
Answer:
13.14
Step-by-step solution: 1. Filling rates: 1/15 + 1/24. 2. Draining rate: 1/31. 3. Net rate = 1/15 + 1/24 - 1/31 = 0.0761 tank/min. 4. Time = 1 / net rate = 13.14 minutes.
1532
A tank is filled by two pipes in 15 min and 20 min respectively, and drained by a third pipe in 32 min. How long to fill the tank if all operate together?
Answer:
11.71
Step-by-step solution: 1. Filling rates: 1/15 + 1/20. 2. Draining rate: 1/32. 3. Net rate = 1/15 + 1/20 - 1/32 = 0.0854 tank/min. 4. Time = 1 / net rate = 11.71 minutes.
1533
A tank is filled by two pipes in 18 min and 26 min respectively, and drained by a third pipe in 34 min. How long to fill the tank if all operate together?
Answer:
15.48
Step-by-step solution: 1. Filling rates: 1/18 + 1/26. 2. Draining rate: 1/34. 3. Net rate = 1/18 + 1/26 - 1/34 = 0.0646 tank/min. 4. Time = 1 / net rate = 15.48 minutes.
1534
A tank is filled by two pipes in 19 min and 22 min respectively, and drained by a third pipe in 33 min. How long to fill the tank if all operate together?
Answer:
14.75
Step-by-step solution: 1. Filling rates: 1/19 + 1/22. 2. Draining rate: 1/33. 3. Net rate = 1/19 + 1/22 - 1/33 = 0.0678 tank/min. 4. Time = 1 / net rate = 14.75 minutes.
1535
A tank is filled by two pipes in 18 min and 26 min respectively, and drained by a third pipe in 31 min. How long to fill the tank if all operate together?
Answer:
16.19
Step-by-step solution: 1. Filling rates: 1/18 + 1/26. 2. Draining rate: 1/31. 3. Net rate = 1/18 + 1/26 - 1/31 = 0.0618 tank/min. 4. Time = 1 / net rate = 16.19 minutes.
1536
A tank is filled by two pipes in 17 min and 22 min respectively, and drained by a third pipe in 31 min. How long to fill the tank if all operate together?
Answer:
13.89
Step-by-step solution: 1. Filling rates: 1/17 + 1/22. 2. Draining rate: 1/31. 3. Net rate = 1/17 + 1/22 - 1/31 = 0.0720 tank/min. 4. Time = 1 / net rate = 13.89 minutes.
1537
A tank is filled by two pipes in 16 min and 25 min respectively, and drained by a third pipe in 31 min. How long to fill the tank if all operate together?
Answer:
14.24
Step-by-step solution: 1. Filling rates: 1/16 + 1/25. 2. Draining rate: 1/31. 3. Net rate = 1/16 + 1/25 - 1/31 = 0.0702 tank/min. 4. Time = 1 / net rate = 14.24 minutes.
1538
A tank is filled by two pipes in 15 min and 22 min respectively, and drained by a third pipe in 32 min. How long to fill the tank if all operate together?
Answer:
12.37
Step-by-step solution: 1. Filling rates: 1/15 + 1/22. 2. Draining rate: 1/32. 3. Net rate = 1/15 + 1/22 - 1/32 = 0.0809 tank/min. 4. Time = 1 / net rate = 12.37 minutes.
1539
A tank is filled by two pipes in 16 min and 23 min respectively, and drained by a third pipe in 31 min. How long to fill the tank if all operate together?
Answer:
13.56
Step-by-step solution: 1. Filling rates: 1/16 + 1/23. 2. Draining rate: 1/31. 3. Net rate = 1/16 + 1/23 - 1/31 = 0.0737 tank/min. 4. Time = 1 / net rate = 13.56 minutes.
1540
A tank is filled by two pipes in 17 min and 26 min respectively, and drained by a third pipe in 30 min. How long to fill the tank if all operate together?
Answer:
15.64
Step-by-step solution: 1. Filling rates: 1/17 + 1/26. 2. Draining rate: 1/30. 3. Net rate = 1/17 + 1/26 - 1/30 = 0.0640 tank/min. 4. Time = 1 / net rate = 15.64 minutes.