Answer:
Red: y=(x+6)^2-1
Blue: y=-(x+3)^2+1
Green: y=(x^2-1)
Orange: y=-(x-3)^2+1
Purple: y=(x-6)^2-1
Step-by-step explanation:
Use Desmos to check
You will first find the unit rate which is single in four hours so then multiply by triple which is 3 and then you get triple will be in 12 hours
The least common denominator is 2