(a) For a concrete mixture containing 370 kg of cement, 1830 kg of aggregate (SSD condition), and 190 kg of mixing water, calculate the temperature of concrete, assuming that the cement and the aggregate are at 30°C and the water has been cooled to 5°C;
(b) For the concrete mixture in part (a), calculate the temperature of concrete, assuming that the cement and the aggregate are at 5°C and the water has been heated to 65°C.