A boat goes 12 km/hr in still water. If the speed of the stream is 4 km/hr, what is the boat's speed downstream?
Show Hint
- 8 km/hr
- 16 km/hr
- 12 km/hr
- 48 km/hr
The Correct Option is B
Solution and Explanation
When a boat travels downstream, it moves in the exact same direction as the flow of the river. Because the water's current is actively pushing the boat forward, we must add the speed of the stream to the boat's normal speed in still water to calculate its total effective speed.
Formula: Speed in Downstream = Speed in Still Water + Speed of Stream.
Step 2: Identify Given Information & Analyze
Based on the question, we are given the following values:
Speed of the boat in still water = 12 km/hr
Speed of the stream = 4 km/hr
Substituting these values into our downstream formula, we get:
Downstream Speed = 12 + 4.
Step 3: Calculation & Conclusion
By simply adding the two speeds together (12 + 4), we find that the effective speed of the boat as it travels with the current is 16 km/hr.
Final Answer: (B)
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