exam Maths Puzzle Numerical Ability

Hello. I really need help with this problem, I'm so confused with my homework. Thank you for your time!

{{{ sqrt( xy^2 ) }}} / 3 {{{ sqrt( z^2 ) }}}

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exam Other Question

While road testing a new car , the reporter for the magazine find that he can go 10 miles into a 3mph wind in the same amount of time that he can go 11 miles with the wind at 3mph An issocles triagle had a perimeter of 370mm.the base of the triangle is 40mm longer than the two equal side.What is the length of each side.