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

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Manager
Joined: 10 Oct 2008
Posts: 56

Kudos [?]: 71 [0], given: 0

Yesterday it took a certain plane 3 hours to fly from City A [#permalink]

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19 Nov 2008, 20:42
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Kudos [?]: 71 [0], given: 0

Senior Manager
Joined: 28 Feb 2007
Posts: 300

Kudos [?]: 44 [0], given: 0

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20 Nov 2008, 01:31
400*3=1200 is distance btw A and B.
1200/450=8/3=2h40min
3h-2h40min=20min. C.

Kudos [?]: 44 [0], given: 0

Re: plane--25   [#permalink] 20 Nov 2008, 01:31
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# Yesterday it took a certain plane 3 hours to fly from City A

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