Question

45 minutes to 1 hour ratio

Answer 1

$h-hour(s)\\min-minute(s)\\\\1h=60min\to45min=\dfrac{45}{60}h=\dfrac{45:15}{60:15}h=\dfrac{3}{4}h\\\\45min\ to\ 1h=\dfrac{3}{4}h:1h=\huge\boxed{3:4}$

Answer 2

First you need each side of the ratio to be in the same units.
The easiest way to do that is to convert 1 hour into minutes.
1 hour=60minutes
So your ratio is now 60:45
Now you need a common factor that goes into both 45 and 60.
15 is the greatest common factor so now divide each side by 15.
45÷15=3
60÷15=4
The ratio, in its simplified for is 4:3