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

I have another piecewise defined function to graph:
f(x) = {x^2 if |x| <=1}
{1 if |x| >1}

If |x| being less than 1 I should get all positive values on the graph, right?

Thank you very much! Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.