<PRE><B>Question 814142</B>
because the question is only concerned about the relative speed between the two airplanes, we can simplify the problem into a single airplane traveling at the combined speed of the two airplanes:
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b = a + 50
s = a + b
s = a + a + 50
s = d / t
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s = 2100 / 2 = 1050 mph
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1050 = a + a + 50
1050 = 2a + 50
2a = 1000
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Answer:
a = 500 mph
b = 550 mph
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