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
The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?
frank
Mathematics its like a complex number. The mother of science.