1. The speed of a boat in still water is 14 km/h and the speed of the current is 2 km/h. The time taken by the boat to travel from point A to point B downstream is 1 hour less than the time taken to the same boat to travel from point B to point C upstream. If the distance between points A and B is 4 km less than that between points B and C, what is the distance between points B and C






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