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Re: A pilot flies an aircraft at a certain speed for a distance of 800 km. [#permalink]
x = be the rate
800/x = (800/x+40) + 2/3

Solving you get -

x^2 + 40x - 48000 = 0

On plugging the values, only option B (x = 200) gives the solution to the equation.
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Re: A pilot flies an aircraft at a certain speed for a distance of 800 km. [#permalink]
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Re: A pilot flies an aircraft at a certain speed for a distance of 800 km. [#permalink]
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