However, we cannot measure instantaneous speeds, but only speed averaged over some time scale by measuring position at two instants of time.

Memorizing the course is crucial, since at speeds averaging 70 miles an hour there is little opportunity for adjustment, and you need every precious instant to react to the unknown and unforseeable, primarily imperfections in the skiing surface.

The road, they say, was designed to carry traffic at 55 miles an hour, but along a 30-mile stretch during rush hours, speeds average below 30 miles an hour.

But among older pedestrians, whose walking speed averaged 0.86 meters per second, only 73 percent crossed in time.

But in the conversational recordings, the speed at times was often averaging 400, and for fragments of utterance it approached 500.

The record is standardized as the speed over a course of fixed length, averaged over two runs (commonly called "passes").

The victor's speed averaged 99.6 miles per hour and the speeds in the chicane were between 60 and 70 m.p.h.

Chiappucci's winning speed averaged to a scorching 37.2 kilometers an hour (about 23 miles an hour).

It is standardized as the speed over a course of fixed length, averaged over two runs in opposite directions.

Our speed has been fluctuating, but averaging warp two.