A well-insulated, thin-walled, double-pipe, counter-flow heat exchanger is to be used to cool oil (cp = 2.20

Question:

A well-insulated, thin-walled, double-pipe, counter-flow heat exchanger is to be used to cool oil (cp = 2.20 kJ/kg∙°C) from 150°C to 40°C at a rate of 2 kg/s by water (cp = 4.18 kJ/kg∙°C) that enters at 22°C at a rate of 1.5 kg/s. Determine
(a) The rate of heat transfer and
(b) The rate of entropy generation in the heat exchanger.