exam Maths Puzzle Numerical Ability

Helped by a strong jet stream, a Los Angeles-to-Boston plane flew 10% faster than usual and made the 4400km trip in 30 min. less time than usual. At what speed does the plane usually fly?

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6-y
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y^2-2y-24 As light penetrates a body of water , its intensity 'I' decreases exponentially. For one particular pond it is known that the light intensity at the surface is 20candela/cm^2 and a