a) 4 kmph
b) 6 kmph
c) 8 kmph
d) None of these
Answer: b
Explanation: Rate downstream
= $$\frac{{16}}{2}$$ kmph = 8 kmph
Rate upstream
= $$\frac{{16}}{4}$$ kmph = 4 kmph
Speed in still water
= $$\frac{1}{2}$$(8 + 4) kmph = 6 kmph
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