Al goes 8 mph; ben goes 22 mph in the opposite direction. how many hours has ben traveled when they are 180 miles apart?

If they are traveling in opposite directions, in relation to each other, they are traveling away from each other at a rate of 30 mph.  Therefore, at a rate of 30mph (that they are driving away from each other at) it will take 180mi/30mph=6 hours to be that far apart.  They will be 180 miles apart at the same amount of time, so the answer is 6 hours.

Hope this helps!