Question

Eric can paint a wall in 14 minutes. His brother, Jessup can paint the same wall in 35 minutes. How long will it take them working together to paint the wall?

Answer 1

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