9.4 27页 1.12

public class Exercise12 {  

public static void main(String[] args){   

double t = ( 40 * 60 +35 )/120 +1 ;   

double s = 24 * 1.6;   double v = s / t;   

System.out.println("平均速度值为"+v+"km/h");  

}

}