If each container holds 1l 275ml of water. how much water is in 609 containers

Pls! does anybody know a shortcut for answering these types of questions in the future?

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

Julie was able to walk 16 km through the zoo in 6 hours. how long will it take her to walk 24 km through the zoo?