She is 'racing against the clock' to be sure the assignment is handed in on time.
Her mind was 'racing'. [=she had many thoughts going quickly through her mind]
Researchers are 'racing (against time)' to find a cure.
(..) tonight, not on my watch.' Don't worry about the doctor. This trial starts Monday. and with two out. And a line drive to left center. Kirby racing. He won't get there. And rounding third is Cal Ripken... and the Twins' streak is over. One strike away, and Andy Milligan (..)1992 A Few Good Men