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A tank contains 50 kg of salt dissolved and thoroughly mixed in 5,000 L of water,...

A tank contains 50 kg of salt dissolved and thoroughly mixed in 5,000 L of water, and zero salt concentration water enters the tank at a steady rate of 1,000 L per hour. The solution kept thoroughly mixed and drains from the tank at the same rate. Water can be used for gardening when salt concentration is 0.4 g/L or less. How long will it take for water in tank to reach that

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