Hot oil (cp = 2.1 kJ/kg•°C) at 110°C and 12 kg/s is to be cooled in a heat exchanger by cold water (cp = 4.18 kJ/kg•°C) entering at 10°C and at a rate of 2 kg/s. The lowest temperature that oil can be cooled in this heat exchanger is
(a) 10°C
(b) 24°C
(c) 47°C
(d) 61°C
(e) 77°C
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