the total distance you run is 400m. so it is the same thing. all 4x100 means is that there are 4 people running 100 meters.
I don't know about the record, but I run the 400m for high school track. My PR is 63 seconds, but there are other girls on my 4 x 4 team who run 56's and they broke the school record. To get anywhere near a scholarship, you have to run at least a 57 for the 400m. It sounds easy but don't under estimate it until you try to run that time.
4 laps of 400m (about 4 laps of 1/4 mile)
They all run 400m depending on where they get the handoff
Each stage is 400m in length.
4 lengths of 25m (not 25km) is 100m So 4x4=16 lengths to make 400m
400 meters is 1/4 mile.
2:54.20 by USA in 1998
100 Meters
World Record 400m Individual Medley Michael Phelps (USA) August 9, 2008 Time: 4:03.84
1 bat 2 ball 3 throw 4 were weird uniforms 5 run
A relay involves 4 people passing on a baton for the race (4X100, 4X400 etc.) A dash is like a sprint and is run individually (100m 200m 400m etc.) The difference is that a relay is run with more than one person.