book Maths Puzzle Numerical Ability

Perform the indicated operations. Simplify the result.

(x^2 - 5x - 14/x^2 - 6x - 7) * (x^2 - 4x -5) / (x^2 + x - 30/2)

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book Other Question

please give the range and domain of this function
f(x)=1/{sqrt(x^2-4)} . A boat travels at the speed of 20 Miles per hour in still water. It travels 48 miles up stream, and then returns to the starting point in a total of five hours. The speed of the current is ____ miles per hour.