It will take 2 hours to paint the room.
What is Ratio?
When a number is divisible by another number, then it can be written in the form a:b, this is called Ratio.
It takes (4/7) of an hour to paint (2/7) room
if (2/7) is painted in (4/7) of an hour
The (7/7) will be painted in x hours
As the ratio are in proportion
(2/7) / (4/7) = ( 7/7) / x
2/4 = 1 /x
x = 2
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