<PRE><B>Question 816348</B>
time going: g 
time return: r = g + 5
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s = d / t 
d = s * t
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D = 48g
D = 28(g + 5)
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48g = 28(g + 5)
48g = 28g + 140
20g = 140
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g = 7 hours
r = 12 hours
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