exam Maths Puzzle Numerical Ability

an airplane flies 1449 miles against the wind and 1539 miles with the wind in a total time of 5hours. the speed of the airplane in still air is 600mph. what is the speed of the wind ?

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y=1/2x+2 a salesperson earns $350 per week plus 10% of her weekly sales. find the sales necessary for the salesperson to earn at least $800 in one week.