A travels to a place which is 320 km away. While going he goes at 40 kmph and returns at 60 kmph. What was the average speed maintained in the overall journey?
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
I was x years old in the year x^2. (when asked his age.)