exam Maths Puzzle Numerical Ability

A plane files 600 miles with a tail wind in 2 hours. It takes the same plane 4 hours to fly the 600 miles when flying against the wind. What is the planes speed in the still air?

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Please help I do not understand what graphing this at all. Thanks so much for any help given.
I am to graph the equation and identify the y intercept.
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