book Maths Puzzle Numerical Ability

I need to Simplify and express in simplest radical form.

How would I simplify

3 square root of 8 + 2 square root of 16

would I get the same square root number of 16 on b

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book Other Question

Can someone help please?

Can these equations be solved?
w + x + y + z = 60
w = 1/2(x + y +z)
x = 1/3(w + y+ z)
y = 1/4(w + x + z)

Thanks
geocee Ruth had a 15-kilometer start on Nadia. How long will it take Nadia to catch Ruth if Ruth travels as 55 kilometers per hour and Nadia travels at 85 kilometers per hour?