1 kilometre = 1000 metres. You now have all the information required to work out, for yourself, the answer to this and similar questions.
154.5 lengths
880 of them.
It will take 880 lengths.
If you mean UK miles, that would be 77.25 lengths!
It depends on the size of the swimming pools. If the pool is small, you need to swim many laps to get to 1/4 mile. 1/4 mile is 440 yards.
70.4 lengths
Do you mean in a swimming pool??
Swimming the 40 foot lengths, it would be 5280/40 or 132. Swimming the 20 foot lengths would be twice that. if you make "circles" around the pool one lap equals 40+20+40+20=120 ft 5280/120 = 44 laps
16 lengths (down and back counts as 2 lengths)
About 28km by road.
2.5 km.
it doesnt matter it can be any size
4 lengths
28km is 91,863.5 feet.
Just over 16 lengths.