book Maths Puzzle Numerical Ability

Hello, I need help I was told to simplify.
5 sqrt 12+6 sqrt 1/3 - 3 sqrt 48
Thank you

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book Other Question

Melissa and Emily leve by car from the same location traveling in opposite directions. Melissa Leaves at 4:00 traveling at 55 mph. Emily travels at 5:00 traveling at 65 mph. At wha x+6/x+3 - 2 = 3/x+3