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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]  23 Sep 2012, 06:59
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96% (02:19) correct 4% (00:00) wrong based on 1 sessions
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]  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: Speed Distance Time   [#permalink] 23 Sep 2012, 07:22
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