Last Problem:
During his walk every day, Ted Jones likes to exercise his dog, Chad, by throwing a Frisbee for him to retrieve. If Ted wants Chad to run as far as possible during the walk every day, what direction should Ted throw the Frisbee for Chad to retrieve?
Answer:
Ted Jones should throw the Frisbee backward so that his dog Chad will have to run the additional distance Ted walks while his dog retrieves the Frisbee.
Today’s Problem:
A frog falls into the bottom of a 20 meter well. In her struggle to get out, she advances 3 meters up the slimy walls of the well; during the night when she rests, the frog slips back 2 meters.
How many days will it take for the frog to escape from the well?