A person can row upstream 20 kmph and downstream 30 kmph. Find the person rate in still water and rate of the stream.
Answers
A) 25,5 B) 10,5 C) 5,5 D) 10,5 E) 1,5
Explanation:   Please remember,   If a is rate downstream and b is rate upstream   Rate in still water = 1/2(a+b)   Rate of current = 1/2(a-b)   =&gt; Rate in still water = 1/2(30+20) = 25 kmph   =&gt; Rate of current = 1/2(30-20) = 5 kmph   Option 25,5
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A person can row upstream 20 kmph and downstream 30 kmph. Find the person rate in still water and rate of the stream.