BASE_FARE = 2.50
RATE_PER_KM = 1.20
NIGHT_SURCHARGE_MULTIPLIER = 1.50
EXTRA_PASSENGER_FEE = 0.30
PASSENGER_THRESHOLD = 4
MINIMUM_FARE = 5.00

NIGHT_START_HOUR = 22
NIGHT_END_HOUR = 6

def is_night_time(hour: int) -> bool:
    return hour >= NIGHT_START_HOUR or hour <= NIGHT_END_HOUR

def calculate_distance_cost(distance: float, hour:int) -> float:
    cost = 0.0
    rate = RATE_PER_KM
    if is_night_time(hour):
        rate *= NIGHT_SURCHARGE_MULTIPLIER

    cost = rate * distance
    return cost

def calculate_extra_passengers_fee(passengers: int) -> float:
    cost = 0.0
    if passengers > PASSENGER_THRESHOLD:
        extra_passengers = passengers - PASSENGER_THRESHOLD
        cost = extra_passengers * EXTRA_PASSENGER_FEE

    return cost

def calculate_taxi_fare(distance: float, hour: int, passengers: int) -> float:
    distance_cost = calculate_distance_cost(distance, hour)
    extra_fee = calculate_extra_passengers_fee(passengers)

    total_fare = BASE_FARE + distance_cost + extra_fee

    cost = max(total_fare, MINIMUM_FARE)

    return cost