Discussion
If a man rows at the rate of 5 kmph in still water and his rate against the current is 3.5 kmph. then the man's rate along the current is
Answer: C
With \( b \) the still-water speed and \( r \) the stream's,
\[ \text{downstream} = b + r, \qquad \text{upstream} = b - r \]
\[ r = b - (b - r) = 5 - 3.5 = 1.5 \text{ kmph} \]
\[ b + r = 5 + 1.5 = 6.5 \text{ kmph} \]
The still-water speed sits exactly midway between the two, so the downstream speed is as far above 5 as the upstream speed is below it - 1.5 kmph either way.
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