Question
Speed of a boat along the stream and against the stream
is 20 km/hr and 18 km/hr respectively. What is the speed of the boat in still water?Solution
 ATQ, Let the speed of the boat in still water = b Let the speed of the stream = w ⇒ b + w = 20    ----eq.(1) Also, b - w = 18    ----eq.(2) Adding eq.1 and eq.2 ⇒ 2b = 38 ⇒ b = 19
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