Answer:
our answer is
or in simplified form
as 
Step-by-step explanation:

We need to solve the above expression
Factors of 60:
1X60, 2X30, 3X20, 4X15, 5X12, 6X10
We need two factors one of which is perfect square
From the above factors only 4X15 full fills our condition as 4 is a perfect square

Solving, we get

So, our answer is
or in simplified form
as 