One lap is usually seen as there-and-back, so a lap is twice the length of the pool. So a lap in a 50 m pool is 100 m. One km is 1000 meters. 1000 / 100 = 10
10 laps in a 50 m pool is 1 km.
If you want it in lengths, then 1000 / 50 = 20
20 lengths makes 1 km.
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That's the wonderful thing with the metrical system. One kilometer is the same as 1000 meters. Hence it takes 1000/25=40 laps to swim a kilometer.
To swim one kilometer in a 25 meter pool, you would need to complete 40 laps. This is because 1 kilometer is equal to 1000 meters, and 1000 divided by 25 equals 40. Each lap is 25 meters, so by swimming 40 laps, you will have covered a total distance of 1000 meters or 1 kilometer.
Well honey, if you're swimming in a 25 meter pool, you'd need to do 40 laps to hit the one kilometer mark. So put on your goggles and get ready to count those laps, because you've got a long way to go!
It depends on how long the pool is, most Swimming Pools are either 25m or 50m long thus 1km (or 1,000m) will be 40 lengths in a 25m pool and 20 lengths in a 50m pool