exam Maths Puzzle Numerical Ability

How would you solve (5a^3b^5)^1/3 X ^3 square root sign 4a^4b?

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exam Other Question

(1/5)X^3+X^2-X-5 An express train and a a local train start out from the same point and travel in opposite directions. The express train travels twice as fast as the local train. If they are 480 miles apart, after 4 hours, what is the average speed of each train?