
    Write a function that calculates the total favorable travel time by summing up the even-numbered travel times (in minutes) that occur at strategic monitoring checkpoints (even-indexed positions) along a delivery route. This calculation helps optimize fleet distribution by identifying patterns in traffic conditions at key monitoring points.
    

    
def sum_even_and_even_index(arr):
    """
    Write a function that calculates the total favorable travel time by summing up the even-numbered travel times (in minutes) that occur at strategic monitoring checkpoints (even-indexed positions) along a delivery route. This calculation helps optimize fleet distribution by identifying patterns in traffic conditions at key monitoring points.
    

    """
def sum_even_and_even_index(arr):
    """
    Write a function that calculates the total favorable travel time by summing up the even-numbered travel times (in minutes) that occur at strategic monitoring checkpoints (even-indexed positions) along a delivery route. This calculation helps optimize fleet distribution by identifying patterns in traffic conditions at key monitoring points.
    

    """
    i = 0
    sum = 0
    for i in range(0, len(arr), 2):
        if arr[i] % 2 == 0:
            sum += arr[i]
    return sum