exam Maths Puzzle Numerical Ability

The box with a volume of 70 inches. Volume = length width and height each side is a prime number of inches long what is each sides length?

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exam Other Question

2 cars leave a gas station at the same time traveling in opposite directions. One car travels 80 kph and the other at 96kph. In how many hours will they be 520 kilometers apart? Divide: 5x^3-5x+1 by x-3

I tried factoring out the 5 and ended up with 5(x^2-x-3)+x as the answer
Am I anywhere close?????