Answer:
6 minutes
Explanation:
Since the answer most certainly would be some number of MINUTES, I changed "3 hours" to minutes. (60 min. in an hour x 3 hrs. = 180 minutes.)
Then, set up the equation:
180 min. x min.
-------------- = --------------
30 windows 1 window
30x = 180
x = 6
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OR ...... you could have simply thought that 30 windows in 3 hours means the same as 10 windows in 1 hour. (30 divided by 3).
Then, that means 10 windows in 60 minutes, which is, 6 minutes. (60 divided by 10.)
