A shell-and-tube heat exchanger is used for heating 10 kg/s of oil (c_p = 2.0 kJ/kg·K) from 25°C to 46°C. The heat exchanger has 1-shell pass and 6-tube passes. Water enters the shell side at 80°C and leaves at 60°C. The overall heat transfer coefficient is estimated to be 1000 W/m²·K. Calculate the rate of heat transfer and the heat transfer area.