After hatching from their eggs, the speed at which miracidia move radially outwards in a search of a snail host is given by:
If the miracidia only live for sixteen hours, what is the maximum area of discovery they will cove?
Source: Rosenberg, R.L. (1984). Elementary Calculus: Course Notes. Ottawa, Canada: Holt, Rinehart and Winston. (Exercise 6: Question 3(v), p. 22)