exam Maths Puzzle Numerical Ability

it takes a plane 5 hours to travel 3000 miles with a tailwind, but it take the same plane 6 hours to travel the same distance with a headwind. hat is the speed of the plane in still air and speed of the wind?

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A woman deposits $50,000 in a savings account with 4% continuously compound interest. How many years must she wait until the balance has doubled? For the following systems of linear equations
-Determine how many solutions exist
-Use either elimination or substitution to find the solutions (if any)
-Graph the two lines,