It will take 880 lengths.
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Oh, dude, let's break out the math for this one. So, if we convert 2.8 kilometers to meters, you get 2800 meters. If each length of the pool is 25 meters, you just divide 2800 by 25, which equals 112 lengths. So, you'd need to swim 112 lengths of that pool to cover 2.8 kilometers. Easy peasy, lemon squeezy.
1 kilometre = 1000 metres. You now have all the information required to work out, for yourself, the answer to this and similar questions.