Answer:
He would need 7.2 hours.
Explanation:
In order to find that amount, we need to figure out what each marker on the number line represents. Since there are 5 on the top and the total amount is 5, it is pretty easy to determine that each is worth 1.
The second number line requires you to divide 12 by 5 to get the amount of each marker.
12/5 = 2.4
So each marker is worth 2.4hrs. Knowing this, we can multiply it by 3 to get the overall value.
3*2.4 = 7.2 hours