MHB How many minutes does it take 14 people to paint 14 walls

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I need help with a question that has been bugging me for a while

Here is the question

It takes 28 minutes for 7 people to paint 7 walls.
How many minutes does it take 14 people to paint 14 walls?
 
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It takes 28 minutes for 7 people to paint 7 walls.

this statement is equivalent to saying it takes 28 minutes for 1 person to paint 1 wall ... so, how long for 14 people to paint 14 walls?
 
Imagine that as two separate work sites. At one 7 people are painting 7 walls. How long does that take them? At the other another 7 people are painting another 7 walls. How long does that take them? And, of course, the two groups of people started at the same time.
 

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