exam Maths Puzzle Numerical Ability

y is greater than or equal to 1/4x-1

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exam Other Question

simplify (2x^4+3x^3y^2+x^3y)+(x^2y)

i divided everything by the (x^2y) and i came up with 2x^2+3xy+x
but since it looks like an addition problem im not sure how to work it out Two planes left an airport at noon. One flew east at a certain speed and the other flew west at twice the speed. The plains were 2700 miles apart in 3 hours. How fast was each plane flying?