This is a university paper question.

If X and Y are independent normal variables having a common mean μ such that

P(2X + 4Y <= 10) + P(3X + Y <=9) = 1 and

P(2X - 4Y <= 6) + P(Y - 3X >= 1) = 1

Determine the value of μ and the ratio of the variance of X and Y.