<PRE><B>Question 932994</B>
x = downhill speed
y = uphill speed = 24 kph
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s = d/t
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1/24 + 1/x = 3.5/48
1/x = 3.5/48 - 1/24
x = 1/(3.5/48 - 1/24)
x = 32
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answer:
x = downhill speed = 32 kph
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