gistfile1.txt

# Constants
GAS_CONSUMPTION_PER_HOUR = 20  # liters per hour
GAS_PRICE_PER_LITER = 3.12  # dollars
TICKET_SPEED_1 = 100  # km/h
TICKET_COST_1 = 200  # dollars
TICKET_SPEED_2 = 120  # km/h
TICKET_COST_2 = 800  # dollars
DISTANCES = [150, 450, 900]  # km

def calculate_trip_cost(speed):
    if speed <= 0:
        return "Speed must be a positive number."
    
    costs = []
    for distance in DISTANCES:
        time = distance / speed
        gas_cost = GAS_CONSUMPTION_PER_HOUR * GAS_PRICE_PER_LITER * time

        # Calculate tickets
        ticket_cost = 0
        if speed > TICKET_SPEED_2:
            ticket_cost = (time // 2) * TICKET_COST_2
        elif speed > TICKET_SPEED_1:
            ticket_cost = (time // 2) * TICKET_COST_1

        total_cost = gas_cost + ticket_cost
        costs.append((time, total_cost))
    
    return costs

# User input
try:
    user_speed = float(input("Enter your planned travel speed (in km/h): "))
    trip_costs = calculate_trip_cost(user_speed)

    if isinstance(trip_costs, str):
        print(trip_costs)
    else:
        for i, (time, cost) in enumerate(trip_costs):
            print(f"{DISTANCES[i]}km - {time:.2f} hours for a cost of {cost:.0f} (including tickets)")
except ValueError:
    print("Please enter a valid number for speed.")