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gmat009: Master | Next Rank: 500 Posts; Posts: 458; Joined: Sun Aug 31, 2008 10:44 amFollowed by: 1 member; Thanked: 3 times

by gmat009 » Mon Nov 24, 2008 6:03 pm

If car X followed car Y across a certain bridge that is 1/2 mile long, how many seconds did it take car X to travel across the bridge?
(1) Car X drove onto the bridge exactly 3 seconds after car Y drove onto the bridge and drove off the bridge exactly 2 seconds after car Y drove
off the bridge.
(2) Car Y traveled across the bridge at a constant speed of 30 miles per hour.

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Source: Beat The GMAT — Data Sufficiency | Mon Nov 24, 2008 6:03 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Mon Nov 24, 2008 6:38 pm

I am getting C).

Whats the oa?

From both statements u can get the time travlled by th leading Y CAR.The x car would have taken 1 sec less since it started 3 seconds behind but finished only 2 seconds behind (gained a sec in the process)

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pbanavara: Master | Next Rank: 500 Posts; Posts: 279; Joined: Wed Sep 24, 2008 8:26 am; Location: Portland, OR; Thanked: 6 times

by pbanavara » Mon Nov 24, 2008 6:57 pm

I think the OA is C:

pretty simple : Option 1 tells that the car x gained over car y by one second - but we don't know the speed of car y so can't obtain the speed of car x

Option 2 - gives the speed of car y so that should do.

So both should be sufficient. If this proves wrong - I'll have to take a serious look at my math skills

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vittalgmat: Legendary Member; Posts: 621; Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members; Thanked: 33 times

by vittalgmat » Mon Nov 24, 2008 10:48 pm

I get C as well.
Here is my reasoning: Y is travels at a constant speed of 30 mph. so we can find out the time taken . say x seconds. From statement 1,
we get X entered 3 sec later, and left 2 sec later than Y. So we can figure out the time for x.

thanks

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orel: Master | Next Rank: 500 Posts; Posts: 247; Joined: Sun Jul 27, 2008 1:39 am; Thanked: 2 times; GMAT Score:660

by orel » Tue Nov 25, 2008 12:15 am

another vote for C

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