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In a double pipe counter-current heat exchanger, the temperature profiles shown in the figure were observed. During operation, due to fouling inside the pipe, the heat transfer rate reduces to half of the original value. Assuming that the flow rates and the physical properties of the fluids do not change, the LMTD (in ${_o}$C) in the new situations is


  1. 0
  2. 20
  3. 40
  4. indeterminate
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