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Speed..............

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Manager
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Speed.............. [#permalink] New post 01 Apr 2009, 02:22
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. A bus trip of 450 miles would have taken 1 hour less if the average speed S for the trip had been greater by 5 miles per hour. What was the average speed S, in miles per hour, for the trip?
(A) 10
(B) 40
(C) 45
(D) 50
(E) 55
Director
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Re: Speed.............. [#permalink] New post 01 Apr 2009, 03:26
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Re: Speed.............. [#permalink] New post 01 Apr 2009, 03:36
s = 450/t ---(1)
s+5 = 450/t-1---(2)

Subsitute s in 2, and we get t=10 or t=-9 ( not possible)
So t=10 => s = 450/10 = 45.
Re: Speed..............   [#permalink] 01 Apr 2009, 03:36
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