| When the boat speed in still water is u km/hr and the stream speed is v km/hr. Speed downstream = (u + v) km/hr. Speed upstream = (u - v) km/hr. |
| When the downstream speed is x km/hr and the upstream speed is y km/hr. Speed in still water = ½ (x + y) km/hr. Rate of stream = ½ (x- y) km/hr. |
OmniGuru