## Elementary Algebra

The average speed of the winner in 1978 was $29.404$ miles per hour faster than the average speed of the winner in 2011.
Subtract the average speed in 2011 from the average speed in 1978 $= 159.73 - 130.326$ $= 29.404$ miles per hr The average speed of the winner in 1978 was $29.404$ miles per hour faster than the average speed of the winner in 2011.