1) A. 2 cm per hour.
Divide 6 cm over 3 hrs to get this answer
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2) F. 1 hr, 50 min
The jump from 7:15 to 9:15 is exactly 2 hours. Take off 10 minutes and the "9:15" drops to "9:05", and at the same time "2 hours" becomes "1 hr, 50 min" when we subtract off 10 min.
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3) B. meters
5 feet = 1.5 meters roughly, which is close enough to the height of any person (more or less)
So if a sunflower is taller than a person, then it makes sense to measure the height in meters
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6) G. 8 square inches
The front face is a rectangle that is 2 by 4, so it has area 2*4 = 8