Speeds of a boat along the current and against the current are 14 km/hr and 7 km/hr respectively. What is the speed of boat (in km/hr) in still water?
Downstream speed of boat = 14 km/hr
Upstream speed of boat = 7 km/hr
=> Speed of boat (in km/hr) in still water = $$\frac{1}{2}\times(14+7)$$
= $$\frac{21}{2}=10.5$$ km/hr
=> Ans - (C)
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