book Maths Puzzle Numerical Ability

The volume of a cube is given by V=s�. Find the length of a side of a cube if the Volume is 729 cm�.

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square root of (5x^2-9)=2x A car makes a 120 mile trip 10 miles per hours faster than a truck. The truck takes 2 hours longer to make the trip. What are the speeds of the car and the truck?