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
There is something I don't understand about algebra: It has been around for thousands of years, yet no one has ever found out what the value of "x" or "y" really is.
Richard van der Merwe
If a problem arise in your mind take help your best friend "mathematics.