A boatman can row a boat downstream at 13 kmph and upstream at 9 kmph. What will be the speed of boat in still water ? (in kmph).
Speed of boat in still water
= $$\frac{1}{2}$$ (downstream + upstream)
= $$\frac{1}{2} (13 + 9) = \frac{22}{2}$$
= $$11$$ kmph
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