exam Maths Puzzle Numerical Ability

heres the question: An ant crawls the height of a tennis ball can that has exactly enough space to contain 3 tennis balls. Another ant crawls around the lip of the can. Which one covers a longer distance?

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the problem is log8(11-6x)=log8(1-x) the book says no solution but I keep coming up with positive 2.
log8 on each side of the equation divides out equally on both sides which leav How do you find the length of arc measurements? This is the problem I am trying to resolve. My answer keeps coming up 4.7 but the answer sheet says 21.5. Please help me understand why my answer is incorrect. Thank You!!!!

162/360 x 15.2(3.14)=