To solve this problem you must apply the formula for calculate the volume of a cylinder, which is shown below: V=πr^2h where r is the radius and h is the height of the cylinder You have that r is 5 ft and h is 3 ft, therefore: V=π(5 ft)^2(3 ft) V=236 ft^3
The lowest time out of all of them is 10.75, so to all the 5th swimmer needs to do to win is to undercut the swimmer who got 10.75s by a 100th of a second. i.e 10.74s or faster (lower) would win.