exam Maths Puzzle Numerical Ability

12a^3/25

(x^2y^-3z)^1/2/x^1/2yz^-1/2

(2radical x - radical y)(radical x +radical y)

-3-radical 18/-6

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Write in slope intercept form 3X-4Y=80 At 3pm a plane leaves London to fly to Madrid which is 1260 miles away. At 4PM a plane leaves Madrid to fly to London. The second plane flies 40 MPH faster than the first plane. If the planes pass one another at 4:30pm, what is the speed of each plane?