exam Maths Puzzle Numerical Ability

Sarah leaves Seattle for Newyork in her car, averaging 80mph across open country. 1hr later a plane leaves Seattle for Newyork following the same route and flying 400mph. Howlong before the plane overtake the car?

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exam Other Question
Business and finance. A country exported $60,000,000 less than it imported, creating a negative trade balance.
I need to come up with a number not sure how to Please help!! Express as a polynomial: (x-a)(x^2-ax/x)