exam Maths Puzzle Numerical Ability

A plane flies 400 miles with the wind and 320 miles against the wind in the same lenght of time. If the speed of the wind is 24 mph, what is the speed of the plane in still air?

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graph f(x)=|x-3|+2 include all intercepts and the vertex. I am not sure how to do the absolute value signs on here but they should go where the parentheses are.
Thank you I know that my car goes from 0 to 60 mph in 4.2 seconds. How do I determine how many feet the car has traveled in the span. If another car goes to 60 in 5 seconds; how many feet will I beat him by.

Thanks for your help