exam Maths Puzzle Numerical Ability

graph f(x) (x-5) / (x^2-16)

solve the inequality f(x) > 0

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exam Other Question

Gavin and Grace, brother and sister, jog to school every day. Gavin jogs at 5 mph and Grace at 2 mph. When Gavin reaches school, Grace is 3/4 mile away. How far is the school from their home? Two towns are 80 km. apart. Sylvia wants to drive from one town to the other in exactly one hour. The first 30 minutes she drives at a rate of 60 km/hr. At what constant rate must she drive for the next thirty minutes to accomplish her goal?