Discussion
A man rows at 5 km/hr in still water and at 3 km/hr against the current. What is his speed along the current ?
Answer: C
Correct answer: 7 km/hr
The upstream speed is \(b - s\), so
\[5 - s = 3 \quad\Longrightarrow\quad s = 2 \text{ km/hr}\]
\[\text{Downstream speed} = b + s = 5 + 2 = 7 \text{ km/hr}\]
The still-water speed always lies exactly midway between the two.
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