Charlie and Chang go driving

Charlie and Chang start at the same point and drive in opposite directions. Charlie drives 44 mph and Chang drives 46 mph. How far apart will they be in 2 hours?

Distance = rate x time 

Charlie
D = rt   {distance = rate x time}
D = 44(2)   {substituted given information into distance formula}
D = 88 miles   {multiplied} 

Chang
D = rt   {distance = rate x time}
D = 46(2)   {substituted given information into distance formula}
D = 92 miles   {multiplied} 

Charlie and Chang's combined distance
= 88 + 92   {added the distances, they are driving in opposite directions}
= 180 miles   {added}

- Algebra House