If a man rows at the rate of 5 kmph in still water and his rate against the current is 3 5 kmph then...........

Quant (SSC) Boats and Streams

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:

5 kmph

6 kmph

6.5 kmph

7.5 kmph

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Explanation:

Upstream rate = 3.5 kmph, Speed of a man in still water = 5 kmph
Let the downstream rate be x kmph, then
By the short trick approach, we get
Speed of the man (boat) in still water = 1/2
[DOWNSTREAM rate + UPSTREAM rate]
⇒ 5 = 1/2(x + 3.5) or x = 6.5 kmph