book Maths Puzzle Numerical Ability

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

square root of 3/5

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book Other Question

write an equation in slope intercept form of the line with each slope and y-intercept.

m=0,b=4 Can you help me solve
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.