exam Maths Puzzle Numerical Ability

Can you help me with this problem?

(64r^3s^-12/12r^-9s^-12)(120r^6/24s^-18)

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exam Other Question

Number 6: Phil can furnish the garage in 12 hours, and Rick can do it in 10 hours. They work together for 3 hours. How long will it take Rick to finish the job alone? Could you please show me how to solve a number to a Power which is less than one such as:

12 to the power of 1/2

Thank you,
Paul