Need help ASAP with 7-9

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

Write 17/20 as a decimal and as a percent.