Answer: 10 minutes
Explanation:
The first thing is to calculate the amount they can paint per minute.
Eric will paint 1/14 per minute
Jessup will paint 1/35 per minute.
Let t represent the time when the work together, then
1/14 + 1/35 = 1/t
49/490 = 1/t
1/10 = 1/t
Therefore , they will spend 10 minutes when working together