
    Given a list of potential delivery routes where each route contains a destination ID and its estimated travel time in minutes, find the destination ID of the route with the shortest travel time. The travel times account for current traffic and weather conditions, and you need to determine which destination should be serviced first to minimize delay.
    

    
from operator import itemgetter

def index_minimum(test_list):
    """
    Given a list of potential delivery routes where each route contains a destination ID and its estimated travel time in minutes, find the destination ID of the route with the shortest travel time. The travel times account for current traffic and weather conditions, and you need to determine which destination should be serviced first to minimize delay.
    

    """
from operator import itemgetter

def index_minimum(test_list):
    """
    Given a list of potential delivery routes where each route contains a destination ID and its estimated travel time in minutes, find the destination ID of the route with the shortest travel time. The travel times account for current traffic and weather conditions, and you need to determine which destination should be serviced first to minimize delay.
    

    """
    res = min(test_list, key=itemgetter(1))[0]
    return res