could you help me?

X Company must purchase a new delivery truck and is using the payback method to evaluate two possible trucks. Truck 1 costs $31,000; Truck 2 costs $47,000. The useful life of both is seven years, with the following estimated operating cash flows: Year Truck 1 Truck 2 $-6,000 $-7,000 8,000 -4,000 -8,000 -3,000 -8,000 -3,000 VOUAWN 6,000 -3,000 -5,000 -2,000 -4,000 -2,000 If X Company chooses Truck 2 instead of Truck 1, what is the payback period (in years)