exam Maths Puzzle Numerical Ability

Thank you in advance for your assistance. I am searching for the forumla (s) to use to solve the following problem any help is appreciated.

College Funds, The first child will s

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Barry can do a certain job in 2 hours, where as it takes Sanchez 3 hours to do the same job. How long would it take them to do the job working together? Determine the volume, in cubic units, of a pyramid whose base is an equilateral triangle of side length 6 and whose other edges are each of length {{{sqrt(15)}}}. Please provide a