Question 227840
If Jones can plow the field in 5 days, then he can plow 1/5 of the field in 1 day.
If Smith can plow the field in 8 days, then he can plow 1/8 of the field in 1 day.
So together, they can plow (1/5 + 1/8 = 13/40) of the field in 1 day.
Which means that they can plow the entire field in 40/13 days.
40/13 = 3.077 days