exam Maths Puzzle Numerical Ability

It takes Brad 2 hours to mow his lawn. It takes Gail 3 hours to mow the same lawn. How long will it take them to mow the lawn if they do the job together?

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A guide dog training center took 1/2 of the puppies at the dog pound. Steve took 1/2 of the remaining. Tanya took the 5 that were left. How many puppies were there to begin with? Thanks for helping me! how do i solve n^2-9n+14=0, by factoring?