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A lock on a canal is sealed by a gate that is 5m wide. The gate is perpendicular to the sides of the lock. When the lock is used there is water on one side of the gate to a depth of 8.3m, and 4.1m on the other side. What height above the bed level does the magnitude of the overall resultant hydrostatic force act on the gate, in m correct to 3 decimal places?