exam Maths Puzzle Numerical Ability

A jet leaves at the average rate of 564 km/hr. A half hour later, another jet leaves at 744km/hr. How long will it be until the second jet overtakes the first?

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exam Other Question

Solve system of equation

3x + 2y - 5z = 6
5x - 4y + 3z = -12
4x + 5y - 2z = 15

Please help! Thank you! f(x)=x^2-3 How do I solve this problem I have tried several times and I do not think I have the right answer