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
231
A boat's speed in still water is 18 km/h and the stream speed is 5 km/h. How long does it take to travel 80 km upstream?
Answer:
6.15
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 18 - 5 = 13 km/h. 3. Time = Distance / Speed = 80 / 13 = 6.15 hours.
232
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 162 km upstream?
Answer:
12.46
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 = 162 / 13 = 12.46 hours.
233
A boat's speed in still water is 13 km/h and the stream speed is 6 km/h. How long does it take to travel 86 km upstream?
Answer:
12.29
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 13 - 6 = 7 km/h. 3. Time = Distance / Speed = 86 / 7 = 12.29 hours.
234
A boat's speed in still water is 19 km/h and the stream speed is 4 km/h. How long does it take to travel 194 km upstream?
Answer:
12.93
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 19 - 4 = 15 km/h. 3. Time = Distance / Speed = 194 / 15 = 12.93 hours.
235
A boat's speed in still water is 12 km/h and the stream speed is 4 km/h. How long does it take to travel 52 km upstream?
Answer:
6.5
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 12 - 4 = 8 km/h. 3. Time = Distance / Speed = 52 / 8 = 6.5 hours.
236
A boat's speed in still water is 15 km/h and the stream speed is 3 km/h. How long does it take to travel 42 km upstream?
Answer:
3.5
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 15 - 3 = 12 km/h. 3. Time = Distance / Speed = 42 / 12 = 3.5 hours.
237
A boat's speed in still water is 16 km/h and the stream speed is 6 km/h. How long does it take to travel 220 km upstream?
Answer:
22.0
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 16 - 6 = 10 km/h. 3. Time = Distance / Speed = 220 / 10 = 22.0 hours.
238
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 102 km upstream?
Answer:
10.2
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 = 102 / 10 = 10.2 hours.
239
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 58 km upstream?
Answer:
5.27
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 = 58 / 11 = 5.27 hours.
240
A boat's speed in still water is 16 km/h and the stream speed is 4 km/h. How long does it take to travel 60 km upstream?
Answer:
5.0
Step-by-step solution: 1. Upstream effective speed = still water speed - stream speed. 2. Effective speed = 16 - 4 = 12 km/h. 3. Time = Distance / Speed = 60 / 12 = 5.0 hours.