To the length of 6.4 meters. 4 meters wide rectangular living room floor tiles. There are two kinds of square tiles on the market with side length of 60 cm and 80 cm. Which one is suitable?

To the length of 6.4 meters. 4 meters wide rectangular living room floor tiles. There are two kinds of square tiles on the market with side length of 60 cm and 80 cm. Which one is suitable?

Choose 80 centimeter just right, need 40 such floor tile