Problems are listed in approximate order of difficulty. A single dot (•) indicates straightforward problems involving just one main concept and sometimes requiring no more than substitution of numbers in the appropriate formula. Two dots (••) identify problems that are slightly more challenging and usually involve more than one concept. Three dots (•••) indicate problems that are distinctly more challenging, either because they are intrinsically difficult or involve lengthy calculations. Needless to say, these distinctions are hard to draw and are only approximate.
• Tom Sawyer and Huck Finn can each row a boat at 5 ft/s in still water. Tom challenges Huck to a race in which Tom is to row the 2000 ft across the Mississippi to a point exactly opposite their starting point and back again, while Huck rows to a point 2000 ft directly downstream and back up again. If the Mississippi flows at 3 ft/s, which boy wins and by how long?
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