Time and Distance query.

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dkumar.83: Senior | Next Rank: 100 Posts; Posts: 90; Joined: Thu Jan 14, 2010 5:42 am; Thanked: 2 times

by dkumar.83 » Tue May 11, 2010 12:28 pm

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Source: Beat The GMAT — Data Sufficiency | Tue May 11, 2010 12:28 pm

debmalya_dutta: Master | Next Rank: 500 Posts; Posts: 385; Joined: Sun Jul 12, 2009 10:16 pmFollowed by: 2 members; Thanked: 29 times; GMAT Score:710

by debmalya_dutta » Tue May 11, 2010 1:15 pm

IMO D

Statement 1 :
Speed of train P = 70 .
Since they cross each other after 2 hours means that P has travelled 140 miles and still has 110 miles to go
this also means train Q has travelled 110 miles and has 140 miles to go
This is sufficient

Statement 2 :
Speed of train Q = 55 .
Since they cross each other after 2 hours means that Q has travelled 110 miles and still has 140 miles to go
this also means train P has travelled 140 miles and has 110 miles to go
This is sufficient again

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liferocks: Legendary Member; Posts: 576; Joined: Sat Mar 13, 2010 8:31 pmFollowed by: 1 member; Thanked: 97 times

by liferocks » Tue May 11, 2010 5:05 pm

From 1,
speed of P at the time of passing Q was 70 miles/hr...but this does not mention what is the average speed throughout the journey or for the past 2 hr..hence we cannot calculate the distance crossed by P in the last 2hrs--->not sufficient

From 2,
average speed of Q through out the journey is 55miles/hr.
hence in 2 hr is crosses 110miles and P crosses 140 miles

so P is closer to the destination.---->sufficient

Ans option B
Please confirm the OA.

"If you don't know where you are going, any road will get you there."
Lewis Carroll

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debmalya_dutta: Master | Next Rank: 500 Posts; Posts: 385; Joined: Sun Jul 12, 2009 10:16 pmFollowed by: 2 members; Thanked: 29 times; GMAT Score:710

by debmalya_dutta » Tue May 11, 2010 5:36 pm

that's a good observation about statement 1.
I stand corrected
imo should be B

liferocks wrote:From 1,
speed of P at the time of passing Q was 70 miles/hr...but this does not mention what is the average speed throughout the journey or for the past 2 hr..hence we cannot calculate the distance crossed by P in the last 2hrs--->not sufficient

From 2,
average speed of Q through out the journey is 55miles/hr.
hence in 2 hr is crosses 110miles and P crosses 140 miles

so P is closer to the destination.---->sufficient

Ans option B
Please confirm the OA.

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