What is the unit rate for 40 meters in 16. seconds?

What is the value of the expression below? (81^2)^1/8

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank