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5 km/hr 8 km/hr 10 km/hr 12 km/hr

Answer :

BSolution :

Let upstream speed = x km/hr , downstream speed = y km/hr <br> Then , `(30)/(x) + (44)/(y) = 10` and `(40)/(x) + (55)/(y) = 13` <br> Put `(1)/(x) = a , (1)/(y) = b` <br> Solve the equations . <br> `a = (1)/(5) , b = (1)/(11)` <br> So , x =5 , y = 11 <br> Speed in still water = `((5 + 11)/(2)) = 8`