A boat goes 120 km along with stream and against stream in 18 hours and the ratio of the speed of stream to boat in still water is 1:3. Find the speed of the boat in still water?
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If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr. Speed upstream = (u - v) km/hr. (a + b) km/hr.
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