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
241
A boat's speed in still water is 19 km/h and the stream speed is 6 km/h. How long does it take to travel 98 km upstream?
Answer:
7.54
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 19 - 6 = 13 km/h. 3. Time = Distance / Speed = 98 / 13 = 7.54 hours.
242
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 160 km upstream?
Answer:
13.33
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 = 160 / 12 = 13.33 hours.
243
A boat's speed in still water is 19 km/h and the stream speed is 5 km/h. How long does it take to travel 210 km upstream?
Answer:
15.0
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 19 - 5 = 14 km/h. 3. Time = Distance / Speed = 210 / 14 = 15.0 hours.
244
A boat's speed in still water is 14 km/h and the stream speed is 6 km/h. How long does it take to travel 152 km upstream?
Answer:
19.0
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 14 - 6 = 8 km/h. 3. Time = Distance / Speed = 152 / 8 = 19.0 hours.
245
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 168 km upstream?
Answer:
15.27
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 = 168 / 11 = 15.27 hours.
246
A boat's speed in still water is 13 km/h and the stream speed is 3 km/h. How long does it take to travel 166 km upstream?
Answer:
16.6
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 13 - 3 = 10 km/h. 3. Time = Distance / Speed = 166 / 10 = 16.6 hours.
247
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 36 km upstream?
Answer:
4.0
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 = 36 / 9 = 4.0 hours.
248
A boat's speed in still water is 18 km/h and the stream speed is 3 km/h. How long does it take to travel 112 km upstream?
Answer:
7.47
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 18 - 3 = 15 km/h. 3. Time = Distance / Speed = 112 / 15 = 7.47 hours.
249
A boat's speed in still water is 16 km/h and the stream speed is 5 km/h. How long does it take to travel 140 km upstream?
Answer:
12.73
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 16 - 5 = 11 km/h. 3. Time = Distance / Speed = 140 / 11 = 12.73 hours.
250
A boat's speed in still water is 17 km/h and the stream speed is 5 km/h. How long does it take to travel 78 km upstream?
Answer:
6.5
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 17 - 5 = 12 km/h. 3. Time = Distance / Speed = 78 / 12 = 6.5 hours.