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Shortcut used: Use downstream = boat speed + stream speed and upstream = boat speed - stream speed.
Solve in 3 steps:
- Identify upstream or downstream.
- Apply the correct effective speed.
- Use distance/time relation.
Common mistake: Do not add stream speed in upstream questions.
Question 1
Multiple Choice Question
Question
A boat moves at 12 km/h in still water and the stream speed is 3 km/h. Find its downstream speed.
Explanation
Correct Answer: C
ANSWER
Correct Answer: C
Method / Topic: Boats and Streams
The downstream speed is 15 km/h.
Why this answer is correct
The answer uses the correct effective speed of the boat.
Short Explanation
The downstream speed is 15 km/h.
Detailed Explanation
Question
A boat moves at 12 km/h in still water and the stream speed is 3 km/h. Find its downstream speed.
ANSWER
Correct Answer: C
Method / Topic: Boats and Streams
Downstream speed = speed in still water + stream speed = 12+3=15 km/h.
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Question 1
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Learn + solve
Shortcut used, common trap, and the fastest solving route
Shortcut used: Use downstream = boat speed + stream speed and upstream = boat speed - stream speed.
Solve in 3 steps:
- Identify upstream or downstream.
- Apply the correct effective speed.
- Use distance/time relation.
Common mistake: Do not add stream speed in upstream questions.
Question
A boat moves at 12 km/h in still water and the stream speed is 3 km/h. Find its downstream speed.
Explanation
Correct Answer: C
ANSWER
Correct Answer: C
Method / Topic: Boats and Streams
The downstream speed is 15 km/h.
Why this answer is correct
The answer uses the correct effective speed of the boat.
Short Explanation
The downstream speed is 15 km/h.
Detailed Explanation
Question
A boat moves at 12 km/h in still water and the stream speed is 3 km/h. Find its downstream speed.
ANSWER
Correct Answer: C
Method / Topic: Boats and Streams
Downstream speed = speed in still water + stream speed = 12+3=15 km/h.
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