Mathematics/General Ability MCQs
Topic Notes: Mathematics/General Ability
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
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
211
A boat's speed in still water is 15 km/h and the stream speed is 4 km/h. How long does it take to travel 186 km upstream?
Answer:
16.91
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 15 - 4 = 11 km/h. 3. Time = Distance / Speed = 186 / 11 = 16.91 hours.
212
A boat's speed in still water is 17 km/h and the stream speed is 4 km/h. How long does it take to travel 126 km upstream?
Answer:
9.69
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 17 - 4 = 13 km/h. 3. Time = Distance / Speed = 126 / 13 = 9.69 hours.
213
A boat's speed in still water is 14 km/h and the stream speed is 3 km/h. How long does it take to travel 40 km upstream?
Answer:
3.64
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 14 - 3 = 11 km/h. 3. Time = Distance / Speed = 40 / 11 = 3.64 hours.
214
A boat's speed in still water is 15 km/h and the stream speed is 6 km/h. How long does it take to travel 90 km upstream?
Answer:
10.0
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 15 - 6 = 9 km/h. 3. Time = Distance / Speed = 90 / 9 = 10.0 hours.
215
A boat's speed in still water is 12 km/h and the stream speed is 3 km/h. How long does it take to travel 100 km upstream?
Answer:
11.11
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 12 - 3 = 9 km/h. 3. Time = Distance / Speed = 100 / 9 = 11.11 hours.
216
A boat's speed in still water is 18 km/h and the stream speed is 6 km/h. How long does it take to travel 96 km upstream?
Answer:
8.0
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 18 - 6 = 12 km/h. 3. Time = Distance / Speed = 96 / 12 = 8.0 hours.
217
A boat's speed in still water is 17 km/h and the stream speed is 6 km/h. How long does it take to travel 222 km upstream?
Answer:
20.18
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 17 - 6 = 11 km/h. 3. Time = Distance / Speed = 222 / 11 = 20.18 hours.
218
A boat's speed in still water is 15 km/h and the stream speed is 5 km/h. How long does it take to travel 74 km upstream?
Answer:
7.4
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 15 - 5 = 10 km/h. 3. Time = Distance / Speed = 74 / 10 = 7.4 hours.
219
A boat's speed in still water is 16 km/h and the stream speed is 3 km/h. How long does it take to travel 172 km upstream?
Answer:
13.23
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 16 - 3 = 13 km/h. 3. Time = Distance / Speed = 172 / 13 = 13.23 hours.
220
A boat's speed in still water is 12 km/h and the stream speed is 5 km/h. How long does it take to travel 68 km upstream?
Answer:
9.71
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 12 - 5 = 7 km/h. 3. Time = Distance / Speed = 68 / 7 = 9.71 hours.