exam Maths Puzzle Numerical Ability

y-99=-18

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The rate of return of certain investments increase as the risk factor of the investment increase.
An investment with a risk factor of 2 has a rate of return of 5.0%.
An investm 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 ?