Help on math question​

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

6cm10 cma conical paper cup has dimensions as shown in the diagram. how much water can the cup hold when full?