1 mile = 1609.3412 metres
1609.3412 / 25 = 64.4 lengths (rounded to the nearest tenth)
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1 mile = 5280 feet. So, number of lengths @ 50 ft/length, = 5280/50 = 105.6 lengths.
To determine how many laps make a mile in a 20-foot by 40-foot pool, we need to calculate the distance of one lap. The distance around the perimeter of the pool is 20 + 20 + 40 + 40 = 120 feet. Since there are 5,280 feet in a mile, we divide 5,280 by 120 to find that approximately 44 laps make a mile in this pool.
89.4 laps (approx).
Just over 32 if I have done the right calculations
0.25 mile = 402.3 metres So 402.3/25 = 16 laps (plus a tiny bit more).