Discussion
In one hour a boat goes 14 km along the stream and 6 km against it. What is the speed of the stream ?
Answer: A
Correct answer: 4 km/hr
The two figures are the downstream and upstream speeds directly, since each is covered in one hour.
\[s = \frac{14 - 6}{2} = 4 \text{ km/hr}\]
\[b = \frac{14 + 6}{2} = 10 \text{ km/hr}\]
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