Select from following answers:- 8 kmph
- 4 kmph
- 6 kmph

- 7 kmph
- All Above
Rate downstream = 16/2 kmph = 8 kmph.
Rate upstream = 16/4 kmph = 4 kmph.
Speed in still water = 1/2 *(8 + 4) kmph = 6 kmph.
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