exam Maths Puzzle Numerical Ability

Can someone help please? # 80. Diagonal brace. The width of a rectangular gate is 2 meters (m) larger than its height. The diagonal brace measures √6m. Find the width and height.
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exam Other Question
1)Please advise if this problem is solved algebraically.
cube root of x minus five equals three
x^1/3 - 5 = 3
x*1/3 - 5 + 5 = 3 + 5
x^1/3 = 8
(x^1/3)^3/1 = 8^3/1
x = 512 A truck travels 2.9 miles at 20 mph, how fast would another truck have to go to cover the same distance in 60 seconds less time?