Stream A with specific heat capacity C_PA = 2000 J/(kg K) is cooled from 90 °C to 45 °C in a concentric double pipe counter current heat exchanger having a heat transfer area of 8 m². The cold stream B of specific heat capacity C_PB = 1000 J/(kg K) enters the exchanger at a flow rate 1 kg/s and 40 °C. The overall heat transfer coefficient U = 250 W/(m² K). Assume that the mean driving force is based on the arithmetic mean temperature difference, that is, [ΔT]_AMTD = (T_A,in + T_A,out)/2 - (T_B,in + T_B,out)/2 where T_i,in and T_i,out refer to the temperature of the i^th stream (i = A, B) at the inlet and exit, respectively. The mass flow rate of stream A (in kg/s), is ______ (rounded off to two decimal places).