Convert 12ms-1 to kilometres per hour

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Asquare parking lot has 6,400 square meters what is the length in meters

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?