book Maths Puzzle Numerical Ability

Simplify by rationalizing the denominator:
(/11-/5)
________
(/11+5)

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book Other Question

A boat can travel on a river 7 miles upstream in the same time it takes to travel 9 miles downstream. Find the speed of the current if the speed of the boat in still water is 8 miles per hour. x^2-5x+3 solve the equation