If the car costs $ 16,920 and we have to make a down payment of $ 600, so we'll have to lease $ 16,920 - $ 600 = $ 16,320
If each month we have to pay $ 340, so we do a simple math to calculate how long it will take to overcome the cost of the car:
$ 16,320 : $ 340 = 48 months
Answer: 48 months.