You can put this solution on YOUR website!
Answer: 58 degrees
it will be easy to explain if there is a figure.
so i will tell the steps.
just draw the figure and you can observe that two isosceles triangles are formed.
because their sides are nothing but circle radii.
and you can easily find the value of the other arc by using the known facts like sum of all angles of a triangle = 180.
If you are still finding it difficult to solve just drop me a mail.