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One hour after Yolanda started walking from X to Y a

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Manager
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Joined: 23 Aug 2004
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One hour after Yolanda started walking from X to Y a [#permalink] New post 23 Apr 2006, 10:30
One hour after Yolanda started walking from X to Y a distance of 45 miles, Bob started walking along the same road from Y to X. If Yolanda's walking rate was 3 miles per hour and Bob's was 4 miles per hour, how many miles had Bob walked when they met?

a) 24
B) 23
C) 22
D) 21
E) 19.5


I need some quick way to solve such questions!

Thanks!
Manager
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Joined: 20 Nov 2004
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 [#permalink] New post 23 Apr 2006, 10:55
After one hour, Yolanda has walked 3 mls. So there are
42 mls left. Since they walk in opposite directions, the
velocities of both add up until they meet. So they will
meet after 42 mls / 7 mph = 6 h. And after 6 h, Bob
has walked 6 h * 4 mph = 24 mls.
  [#permalink] 23 Apr 2006, 10:55
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One hour after Yolanda started walking from X to Y a

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