exam Maths Puzzle Numerical Ability

What is the coefficient of 6/x^2 and the variable part?

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Please help me with this problem:
I did this but I was told is wrong
36^1/2/15^2 = 6/225 = 2/75 It takes a computer 8 days to print all of the letters for a sweepstakes. A new computer is purchased that can do the same job in 5 days. How long would it take both computers working on it.