If I understand correctly, you went wrong because you solved for Y instead of M, like the question dictates.
The raised price represents 110% of the original price (100% plus the extra 10%)
A percentage is converted into a decimal multiplier by dividing by 100:

To clarify the final stage, consider this (where

is the original price):


From here, basic algebraic rules make solving for

easy:

Therefore the original price of a ticket was $175
to solve this we need to isolate the x variable.
subtract 1 from each side: [3x+4] = 6
now we can drop the parentheses and subtract 4 from each side: 3x = 2
divide each side by 3: x = 2/3
The measure of a major arc would be more than 180 degrees
so the answer would be 196 degrees
3.5 days because 4 days will put the infant over