The current world record for the mile is about 3:43.
The world record for the 3-mile run is 12 minutes and 51 seconds, set by Daniel Komen of Kenya in 1997.
The world record for swimming a mile is held by Sun Yang of China. Sun's time is 14 minutes 31 seconds, set in 2012.
3:57
The world record for the fastest mile on a bike is held by Thomas Dekker of the Netherlands, with a time of 3 minutes and 18.4 seconds, set in 2004.
The current world record for running a mile is 3 minutes and 43.13 seconds, set by Hicham El Guerrouj of Morocco in 1999.
The mile and a half run is extremely rarely, if ever contested by elite runners. However based on current world records for the mile and two mile, we can infer that the world record if it were commonly contested would probably be about 5:50.
The men's world record for the two mile run is held by Daniel Komen of Kenya. His time was 7:58. 61. For women the record is 8:58. 58 which is held by Meseret Defar from Ethiopia.
The current world record for swimming a mile (1,609 meters) is held by Katie Ledecky, with a time of 15 minutes and 20.48 seconds. She achieved this record in 2018.
Hicham El Guerrouj set the world record for the mile with a time of 3:43.13, which is equivalent to an average speed of about 16.1 miles per hour.
According to Gerry Lindgren, the men's 4 mile world record is 16:08, set by Gerry Lindgren in 1968 just prior to the Olympics. He apparently ran the time at Mt. Sac, claiming that he averaged 4:02 per mile over the hilly course. An unbelievable time, literally, considering he would have set the 3000 meter, 2 mile, 3 mile, and 5000 meter world records (set on a track, mind you) along the way. The real answer to the question is presumably the time Bekele recorded while en route to his 10000 meter world record of 26:17. According to a pace calculator, his time at 4 miles was roughly 16:55.
Svetlana Masterkova holds the world record for the Mile run at 4:12.56 which is 9.35 meters longer than the 1600. Her mile time is more than three seconds faster than the second best ever. Additionally Masterkova was known for winning her races from the front, rather than sprinting for the finish, so it is impossible any other individual could have arrived at the 1600 meter mark ahead of her adjusted mile time or even her actual mile time.