exam Maths Puzzle Numerical Ability

draw a cube and rectangular prism that would be filled exactly by 512 cubic yards of sand

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exam Other Question

The speed of train A is 16 mph slower than the speed of train B. Train A travels 220 miles in the same time it takes train B to travel 300 miles. Find the speed of each train. (a1/4b1/3)^3 (a1/6b2/3)^3

I have tried distributing the exponents to the top of the fraction and then adding the like terms. It just does not look right when I finish.