There is no graph, so it is impossible to answer this question. I apologise.
24.33 is the answer to this question
In four hours, he drives: = 252
So, Unit rate = 252/4 = 63 mph
In seven hours, it would be = 63 * 7 = 441 miles
Hope this helps!
2 over 3 plus 5 equals 5 and 2 over 3