Set up an equation that can be used to solve the problem. Solve the equation and answer the question asked.

Two friends decide to meet in Chicago to attend a Cubs baseball game. Rob travels 224 miles in the same time that Carl travels 196 miles. Rob's trip uses more interstate highways and he can average 7 mph more than Carl. What is Rob's average speed?
a) 49 mph

b) 52 mph

c) 56 mph

d) 60 mph
This is all the information in the question.