public class ConstructorEx3 {

        int Speed;
        int Distance;
        int Minute;
        public int getTime (){
            return  ((Distance/Speed)*Minute);
        }
        ConstructorEx3 (){
            Distance = 60;
            Speed    = 30;
            Minute   = 60;
        }
        ConstructorEx3 (int D, int S, int M){
            Distance = D;
            Speed    = S;
            Minute   = M;
        }
        public static void main (String []arsh){
            ConstructorEx3 Bike1,Bike2;
            Bike1 = new ConstructorEx3();
            Bike2 = new ConstructorEx3(40,80,60);

        System.out.println("Bike one is travelling at : "+ Bike1.getTime());
        System.out.println("Bike two is travelling at : "+ Bike2.getTime());

        }
}

Distance = 40;
Speed = 80;
Minute - 60;

Distance / Speed = 0.5;

public class ConstructorEx3 {

        int Speed;
        int Distance;
        int Minute;
        public int getTime (){
            double v = ((double)Distance/(double)Speed);
            v= v * (double)Minute;
            return (int)v;
//          return  ((Distance/Speed)*Minute);
        }
        ConstructorEx3 (){
            Distance = 60;
            Speed    = 30;
            Minute   = 60;
        }
        ConstructorEx3 (int D, int S, int M){
            Distance = D;
            Speed    = S;
            Minute   = M;
        }
        public static void main (String []arsh){
            ConstructorEx3 Bike1,Bike2;
            Bike1 = new ConstructorEx3();
            Bike2 = new ConstructorEx3(40,80,60);

        System.out.println("Bike one is travelling at : "+ Bike1.getTime());
        System.out.println("Bike two is travelling at : "+ Bike2.getTime());

        }
}

Bike one is travelling at : 120
Bike two is travelling at : 30