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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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9y ago

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