Choose the two examples that represent volume. A. the length of a path
B. the surface of a mirror
C. the amount of sand in a sand castle
D. the amount of water in a water balloon
E.
the amount of weight an elevator can hold

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.