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Yesterday it took a certain plane 3 hours to fly from City A

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Yesterday it took a certain plane 3 hours to fly from City A [#permalink] New post 19 Nov 2008, 19:42
Yesterday it took a certain plane 3 hours to fly from City A to
City B at an average speed of 400 miles per hour. Today the
same plane flew from City A to City B along the same route at
an average speed of 450 miles per hour. How many more
yesterday than it took today?
A. 10
B. 15
C. 20
D. 25
E. 30
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Re: plane--25 [#permalink] New post 20 Nov 2008, 00:31
400*3=1200 is distance btw A and B.
1200/450=8/3=2h40min
3h-2h40min=20min. C.
Re: plane--25   [#permalink] 20 Nov 2008, 00:31
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Yesterday it took a certain plane 3 hours to fly from City A

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