1, solution: When the daily rent increases by X yuan, the total rental income reaches 19440 yuan. According to the meaning of the question: (160+x) (120-6x/1o) = 19440 solution: X=20 A: When the daily rent increases in 20 yuan, the total rental income will reach19440 yuan. 2. Solution: (1) When p and q start for x seconds, the area of quadrilateral PBCQ is 33 square centimeters. According to the meaning of the question, 6 (16-3x+2x)/2 = 33x = 5a: when P and Q start for 5 seconds, the area of quadrilateral PBCQ is 33 square centimeters. (2) Assuming that p and q start for x seconds, the distance between p and q is 10 cm. According to the meaning of the question, (16-3x-2x) 2 = 102-62 (note that the square is behind the brackets, and the square is also behind10 and 6) X=8/5 or X=24/5 A: When P and Q leave 8/5 or 24.