Answer:
9:42
Step-by-step explanation:
First, convert his second run into minutes so its easier to simplify
than divide both the timings by 5
to get the answer as 9:42 as the simplest ratio form
3a-3b-5c
((3a-3b)²-(5c)²)÷(3a-3b+5c)=((3a-3b-5c)(3a-3b+5c))÷(3a-3b+5c)=3a-3b-5c
Twelve million three hundred fifty thousand