book Maths Puzzle Numerical Ability

Give the coordinates of a point on a coordinate grid that is a distance of the square root of 5 from point 1,3. Is there a formula to find the answer and how do you work out this problem?
Thank you

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book Other Question

The two digits in Jack's age are the same as the digits in Bill's age, but in reverse order. In five years Jack will be twice as old as Bill will be then. What is the difference in hello,
this problem is driving me crazy. It is,in paranthesis, (3 sqrt 5)^5
Could you please show me how it is worked?
Thank you