A man can route three-quarters of a kilometre against the stream in 11 1/4 minutes. The speed (in km/hr) of the man in still water is
(a) 2 (b) 3 (c) 4 (d) 5
Pure mathematics is the world's best game. It is more absorbing than chess, more of a gamble than poker, and lasts longer than Monopoly. It's free. It can be played anywhere - Archimedes did it in a bathtub.
Richard J. Trudeau, Dots and Lines
MATHEMATICS is not a magic but it involves "LOGIC"