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One hour after Yolanda started walking from X to Y, a distan [#permalink]
28 Jan 2004, 15:43

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Difficulty:

25% (medium)

Question Stats:

79% (02:17) correct
21% (01:58) wrong based on 138 sessions

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 Bobт's was 4 miles per hour, how many miles had Bob walked when they met?

When bob starts walking The distance between them is 45-3 = 42 miles
If they meet at time t then Yolanda would have walked
X/3 minutes and Bob would have walked (42-X)/4 mins
X/3 = (42-X)/4 so X = 18
Bob would have walked 42-18 = 24 miles.

One hour after Yolanda started walking from X to Y, a distan [#permalink]
18 Jul 2010, 09:52

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?

Re: Problem Solving : Average [#permalink]
18 Jul 2010, 13:44

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Expert's post

EnterMatrix wrote:

One hour after Yolander started walking from X to Y, a distance of 45 miles, Bob started walking along the same road from Y to X. If Yolander’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? ○ 24 ○ 23 ○ 22 ○ 21 ○ 19.5

When B started walking Y already has covered 3 miles out of 45, hence the distance at that time between them was 45-3=42 miles.

Combined rate of B and Y was 3+4=7 miles per hour, hence they would meet each other in 42/7=6 hours. In 6 hours B walked 6*4=24 miles.

Re: One hour after Yolanda started walking from X to Y, a [#permalink]
18 Sep 2013, 17:03

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