<PRE><B>Question 823817</B>
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s = d / t
d = s * t
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out:
d = 220 * (t - 1)
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back:
d = 200 * t
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200t = 220(t - 1)
200t = 220t - 220
220t - 200t - 220 = 0
20t = 220
t = 11
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answer:
trip there took 10 hours, and the return trip took 11 hours
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