exam Maths Puzzle Numerical Ability

1 - 4/y^2 / 1-2/y-8/y

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Can you please help me solve this word problem:

An airplane traveling at 450 mph enters a region with a headwind of 25 mph. How long will it take the plane to travel 950 miles into this wind? Janet invested $27,000, part at 15% and part at 9%. If the total interest at the end of the year is $3,390, how much did she invest at 15%?