Answer:
540 minutes or 9 hours :)
Explanation:
What I did is I multiplied 6 hours by 60 minutes. Or for the hours skip that step.
6x60=360 or 6/300=0.02
360/300=1.2 or 0.02x450=9
1.2 x450= 540 or 9 hours
540 minutes
540 minutes or 9 hours :D
Goodluck <3
Hope this helps!