book Maths Puzzle Numerical Ability

I'm not sure how to get the square root of 81c^5d^4
Could you help me? thanks!

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book Other Question

it takes a passanger train 2 hous less time than it takes a freight train to make the trip from central city to clear creek. the passenger train averages 96 km/h while the freight train averages 64 km/h. How far is it from central city to clear creek? x-1/(x-5) = 4/(x-5)