exam Maths Puzzle Numerical Ability

2 planes leave Newyork AT 10am, one heading for Europe at 600mph and one heading in the opposite direction at 150mph. At what time will they be 900 miles apart?

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Can someone help me on this problem?

The sum of two numbers is 33. Their difference is 11. What are the two numbers?

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Ashley I need to know how to find the volume of a cube. The question states. The volume of a cube is given V=s^3. Find the length of a side of a cube if the Volume is 729cm^3.