book Maths Puzzle Numerical Ability

Simplify and evaluate (x3y-4z0/5x6y8)3

Thanks for any help you can give, i could not figure this out :)

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book Other Question

A and B are 30km apart. If they leave at the same time and travel in the same direction, A overtakes B in 60 hours. If they walk toward each toher, they meet in 5 hours. What ar 55% of 13