First factor each number
39=3*13
52=4*13
Now find the greatest common factor, which in our case is 13.
Answer: 13
i have attached a file you can see it from there.
They could be 28 + 29 + 30
The movie should be 2 hours and 15 minutes long.
The diameter is the radius doubled. So, the radius CK is 2, so the diameter would be 4.