Solve.A plane flying with a tailwind flew at a speed of 420 mph, relative to the ground. When flying against the tailwind, it flew at a speed of 300 mph. Express these relationships as equations. Let x represent the speed of the plane in calm air and let y represent the speed of the wind.
A. x + y = 420
y = 300
B. x + y = 300
x - y = 420
C. x + y = 300
y = 420
D. x + y = 420
x - y = 300
Answer: D
Mathematics
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.
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B. 
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A. 100 and 
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