book Maths Puzzle Numerical Ability

How long does it take to travel 4/10 of a mile at 45mph

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book Other Question

simplify this problem
6x^2-54
________=
4x^2-36

thanx I have a string of Christmas lights that is 100 feet long, and, I want to hang it in the form of a rectangle that its length is, at least twice its width or more; what is the range