exam Maths Puzzle Numerical Ability

1/i please help me simplify this and show all work

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exam Other Question

Arlene and AJ are Chemist. AJ can do an emulsion polymerization experiment in 10 hours. If AJ and Arlene work together they can do the experiment in 6 hours. How long will it take Arlene working by herself to do the experiment? The sum of 4 hours and 17 minutes, 3 hours and 58 minutes, 45 minutes, and 7 hours and 12 minutes is?