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- Identify upstream or downstream.
- Apply the correct effective speed.
- Use distance/time relation.
Correct Answer: A
Correct Answer: A
Method / Topic: Boats and Streams
The answer uses the correct effective speed of the boat.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Boats and Streams
Downstream speed=15 km/h and upstream speed=10 km/h. Their average gives still-water speed=(15+10)/2=12.5 km/h.
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Identify upstream or downstream.
- Apply the correct effective speed.
- Use distance/time relation.
A boat covers 30 km downstream in 2 hours and the same distance upstream in 3 hours. What is its speed in still water?
Explanation
Correct Answer: A
Method / Topic: Boats and Streams
The answer uses the correct effective speed of the boat.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Boats and Streams
Downstream speed=15 km/h and upstream speed=10 km/h. Their average gives still-water speed=(15+10)/2=12.5 km/h.
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