A double-pipe counter-flow heat exchanger transfers heat between two water streams. Tube side water at 19 liter/s is heated from 100C to 380C. Shell side water at 25 liter/s is entering at 460C. Assume constant properties of water; density is 1000 kg/m3 and specific heat is 4186 J/kg.K. The LMTD (in 0C) is ________