book Maths Puzzle Numerical Ability

My problem:
A plane flies 400 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 20 mph, whqat is the speed of the plane in still air?

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book Other Question

May I please have some help? A soccer field is 336yd^2. The width is 5yd longer than its length. What is the length and width of the soccer field. Thanks for your help. We have to slope and figure out the y-intercept in Algebra1 I know how to find the slope and y-intercept but i don't know how to graph!!!