A 40 cm piece of string can be cut into eight 5 cm pieces.
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40*25 = 1000 metres or 1 kilometre.
If the figures represent lengths measured in feet then, 20 x 40 = 800 sq feet
2 x 2 x 2 x 5 = 40
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.
2 x 2 x 2 x 5