Rudy runs 5 miles at a rate of 10 minutes per mile. Later he runs 4 miles at a rate of 9.5 minutes per mile. What is the total length of time that Rudy runs?
Rudy first runs for 5 * 10 = <<5*10=50>>50 minutes.
Then Rudy runs for 4 * 9.5 = <<4*9.5=38>>38 minutes.
Rudy runs for a total length of 50 + 38 = <<50+38=88>>88 minutes
#### 88