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Sep 13, �� If in the question, you are provided with the upstream and the downstream speed U and D respectively, to determine the speed of boat and stream the formula goes like Speed of boat B = (D + U) / 2 Speed of stream S = (D - U) / 2 Also, always have with you the basic speed formula. Nov 21, �� Speed upstream = (u � v) km/hr. If the speed downstream is a km/hr and the speed upstream is b km/hr, then Boat Speed in still water = ? (Downstream Speed + Upstream Speed) = 1/2 x (a + b) km/hr. Rate of stream = ? (Downstream Speed � Upstream Speed) = 1/2 x (a � b) km/hr. ? b = (d+u) / 2 which gives the speed of the boat in terms of downstream and upstream speed. Subtracting the equation (i) and (ii), we get d � u = 2w ? w = (d-u) / 2 which gives the speed of the stream in terms of downstream and upstream speed. You should remember these boats and streams formulas. Must Read Boat and Streams Articles.
Final:
You already know the below equation. Login Sign Up. Each boat travels at a constant speed though their speeds are different. For the same journey it takes 16 hr if river is flowing. Solution: Take out the formula book. How much time will it take to cover km in still water? Find speed of the boat in still water.
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