1:3, Because you can simplify the numbers by dividing by two.
Two trips a day for 5 days = 10 trips
(3/10)(10)= 3 miles
BD=10 because it is symmetrical to AD.
Volume of a cylinder is

, where r is the radius and h is the height.
This comes from the area of a circle being

. A cylinder is the area of the base circle multiplied by its height.
Using this formula, the volume of the given cylinder is