Answer:
About 1 year.
Step-by-step explanation:
Since the spacecraft travels the 386,400 kilometers of distance between the Earth and the Moon in 3 days, and the planet Mars is 140 times further from the Earth than the Moon, to obtain the time it will take for the same spacecraft to reach Mars must perform the following calculation:
140 x 3 = 420 days
If a year has 365 days, the travel time that said spacecraft would take to reach Mars would be just under 1 year and 2 months.