book Maths Puzzle Numerical Ability

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A car travels 180 mi. A second car, traveling 15 mi/hr faster than the first car, makes the same trip in 1 h less time. find the speed of each car.

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I need to simplify in simplest radical form. I really don't understand how to do this with fractions.

square root of 3/5 Please help, I have tried many ways and seem to not get an answer
the four corners are cut from an 81/2 inch by 11 inch sheet of paper. Corners are 2in find the perimeter of the