exam Maths Puzzle Numerical Ability

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 takeo Arlene working by herself to do the experiment?

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1)Seven inches are equivalent to 17.78 cm. Find the equation converting length in cm to length in inches. What is the length in inches of a 96.2 cm bar? How about graphing y=3/2-4?