Answer:
24 miles
Step-by-step explanation:
Make a proportion
He is traveling at a constant rate of 12 miles/hour, so
he can go 12 miles in 1 hour, and x miles in 2 hours
12/1=x/2
Multiply both sides by 2
2*12/1=x/2 *2
24=x
So, in 2 hours he can travel 24 miles