Java Walk/Run Cycle Distance

A person is walking/running a total distance of 9000 ft. First, she walks for 700 ft at a speed of 4 ft/sec and then runs 900 ft at a speed of 10 ft/sec. This walk/run cycle is repeated till she gets to the destination. I need help with an if/else if statement to determine if they are walking or running for the remaining distance.

public static void main(String[] args) {
    Scanner k = new Scanner(System.in);
    double speed_walk;
    double speed_run;
    double length_of_walk;
    double length_of_run;
    double total_destination;
    double time_to_walk;
    double time_to_run;
    double total_time_run_walk;
    double length_each_walk_run;
    double total_walk_run_seg;
    double time_all_seg;
    double completed_segs;
    double remaining_distance;
    double time_last_seg;
    double total_time_destination;
    double total_hours;
    double total_mins;
    double total_sec;
    System.out.print("Enter the total destination in feet: ");
    total_destination = k.nextDouble();
    System.out.print("Enter the length of walking in feet: ");
    length_of_walk = k.nextDouble();
    System.out.print("Enter the walking speed in ft/sec: ");
    speed_walk = k.nextDouble();
    System.out.print("Enter the length of running in feet: ");
    length_of_run = k.nextDouble();
    System.out.print("Enter the running speed in ft/sec: ");
    speed_run = k.nextDouble();



    time_to_walk = length_of_walk / speed_walk;
    time_to_run = length_of_run / speed_run;
    total_time_run_walk = time_to_walk+ time_to_run;
    length_each_walk_run = length_of_walk + length_of_run;
    total_walk_run_seg = total_destination / length_each_walk_run;
    completed_segs =(int)(total_walk_run_seg);
    time_all_seg = completed_segs*(total_time_run_walk);
    remaining_distance = (total_walk_run_seg - 5) * length_each_walk_run;


  time_last_seg = (remaining_distance - length_of_walk) / 10;
    total_time_destination =  time_all_seg + time_to_walk 
+ time_last_seg;

     System.out.println("Time it takes to walk= " + time_to_walk);
     System.out.println("Time it takes to run= " + time_to_run);
     System.out.println("Total time for each walk + run segment= " + total_time_run_walk );
     System.out.println("Length of each walk + run segment= " + length_each_walk_run);
     System.out.println("Total number of walk + run segments needed for the entire destination= " + total_walk_run_seg);
     System.out.println("Time it take for all complete segments= " + time_all_seg );
     System.out.println("Remaining distance to destination= " + remaining_distance);
     System.out.println("Time it take for the last ft of running to destination= "  + time_last_seg );
     System.out.println("Total time to destination= " + total_time_destination);


}

}