A man can row upstream 10 kmph and downstream 30 kmph. Find the rate of the stream and man rate in still water. Choose the correct choice from the following choices: A) 15,20 B) 30,20 C) 1,20 D) 20,20 E) 10,20
10,20xplanation:   Please remember,   If a is rate downstream and b is rate upstream   Rate of current = 1/2(a-b)   Rate in still water = 1/2(a+b)   =&gt; Rate of current = 1/2(30-10) = 10 kmph   =&gt; Rate in still water = 1/2(30+10) = 20 kmph   Option 10,20
<result>E</result>
A man can row upstream 10 kmph and downstream 30 kmph. Find the rate of the stream and man rate in still water.