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11.
A man rows down a river 15 km in 3 h with the stream and returns in $7 1 half straight h.$ The rate at which he rows in still water is

2.5 km/h

1.5 km/h

3.5 km/h

4.5 km/h

3.5 km/h

Rate downstream (a) = $15 over 3 space equals space 5 space km divided by straight h$
Rate upstream (b) = $fraction numerator 15 over denominator begin display style 15 over 2 end style end fraction space equals space fraction numerator 15 space cross times space 2 over denominator 15 end fraction space equals space 2 space km divided by straight h$
Man's rate in still water:
$equals space 1 half left parenthesis 5 space plus space 2 right parenthesis space equals space 3.5 space km divided by straight h$

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12.

A boat goes 15 upstream and $10 1 half km$ downstream in 3 hours 15 minutes. It goes 12 km upstream and 14 km downstream in 3 hours. What is the speed of boat in still water.