<PRE><B>Question 924350</B>
x = speed of passenger train
y = speed of freight train
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s = d/t
t = d/s
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x = 110/t
y = 90/t
y = x - 10
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y = 90/t
x - 10 = 90/t
x = 90/t + 10
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x = 90/t + 10
x = 110/t
90/t + 10 = 110/t
20/t = 10
t = 2 hours
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answer:
x = 110/t
x = 110/2
x = speed of passenger train = 55 mph
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y = 90/t
y = 90/2
y = speed of freight train = 45 mph
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