An absorption air-conditioning system is to remove heat from the conditioned space at 20oC at a rate

Question:

An absorption air-conditioning system is to remove heat from the conditioned space at 20oC at a rate of 150kJ/s while operating in an environment at 35oC. Heat is to be supplied from a geothermal source at 140oC. The minimum rate of heat supply is
(a) 86kJ/s
(b) 21kJ/s
(c) 30kJ/s
(d) 61kJ/s
(e) 150kJ/s