Hari Rams present age is three times his sons present age and two fifth of his fathers present age. The average of the present age of all of them is 46 years. What is the difference between Hari Rams sons present age and Hari Rams fathers present age?

Correct Answer: 78 yrs

Let Hari Ram's present age = x

Then, his son's age = x/3

Father's age = 5x/2

x + x3 + 52x3 = 46=> x = 36 yrs

Now the required difference = 52x36 - 363 = 78 yrs