exam Maths Puzzle Numerical Ability

The sum of the present ages of Eric nd his father is 58 years. In 10 years, his father will be twice as old as Eric will be at that time. Find their present ages.

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I need help with this word problem:

If you stand in shallow water and look at an object below the surface of the water, the object will look farther away from you than it really Mercy can prepare a manuscript in 6 hours. Eunice can prepare it in 4 hours. How Long would it take them to preapre the manuscript together?