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Two cars were driven by A and B. They were 580 miles apart

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Two cars were driven by A and B. They were 580 miles apart [#permalink]

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Two cars were driven by A and B. They were 580 miles apart when they started driving towards each other.A's car had traveled at a speed of 20 miles per hour, 4 hours per day for 5 days when it had met B's car. If B had driven 3 hours per day for 5 days, what was B's speed in miles per hour?

A) 8
B) 9
C) 10
D) 11
E) 12
[Reveal] Spoiler: OA

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Last edited by Bunuel on 23 Sep 2012, 08:49, edited 1 time in total.
Renamed the topic.

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Re: Speed Distance Time [#permalink]

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New post 23 Sep 2012, 07:22
A would have traveled 20*4 = 80 miles every day and in total 80*5= 400 miles when he met B

So B should have traveled 580-400= 180 miles

Given
B traveled for 5 days ,so B traveled 180/5 = 36 miles per day
and since B traveled only 3 hr per day.. speed of B is 36/2 =12 miles/hr

Ans: E
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Re: Two cars were driven by A and B. They were 580 miles apart [#permalink]

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New post 15 Nov 2014, 07:58
Hello from the GMAT Club BumpBot!

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Re: Two cars were driven by A and B. They were 580 miles apart [#permalink]

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New post 17 Nov 2014, 12:02
1. At 20mph for 4 hours a day, then driver A was traveling 80 miles per day. When A met with B, A had already traveled 400 miles.

2. This means that driver B had traveled 580-400 = 180 miles upon meeting up with A. B traveled a total of 3 x 5 = 15 hours (3hrs/day for 5 days). 180 miles / 15 hours = 12mph

3. Answer E!

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Re: Two cars were driven by A and B. They were 580 miles apart [#permalink]

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New post 20 Nov 2014, 01:39
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Single equation for this problem:

\(Speed of B = \frac{580 - (20*4*5)}{3*5} = \frac{180}{15} = 12\)

Answer = E
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Re: Two cars were driven by A and B. They were 580 miles apart [#permalink]

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New post 03 Oct 2016, 10:12
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Two cars were driven by A and B. They were 580 miles apart [#permalink]

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New post 14 Aug 2017, 13:18
ExuberantRahul wrote:
Two cars were driven by A and B. They were 580 miles apart when they started driving towards each other.A's car had traveled at a speed of 20 miles per hour, 4 hours per day for 5 days when it had met B's car. If B had driven 3 hours per day for 5 days, what was B's speed in miles per hour?

A) 8
B) 9
C) 10
D) 11
E) 12




20(4)(5) +3(5)(x)= 580
400 +15x =580
15x=180
x= 12

E

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Re: Two cars were driven by A and B. They were 580 miles apart [#permalink]

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New post 14 Aug 2017, 15:04
I could not understand why this question can't be solved in this manner?

20 + x= 580/35

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Re: Two cars were driven by A and B. They were 580 miles apart   [#permalink] 14 Aug 2017, 15:04
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