word problem

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sud21: Master | Next Rank: 500 Posts; Posts: 344; Joined: Sat Nov 12, 2011 3:21 amFollowed by: 2 members; Thanked: 1 times

by sud21 » Thu Jan 26, 2012 7:33 am

G and R went to a same position for a picnic. G went by bike and R drove a car. Did R arrive there earlier than G?
1). G start out 30 minutes earlier than R
2). The speed of G is 10m/h, and the speed of R is 30 m/h

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Source: Beat The GMAT — Data Sufficiency | Thu Jan 26, 2012 7:33 am

mj78ind: Master | Next Rank: 500 Posts; Posts: 265; Joined: Mon Dec 28, 2009 9:45 pmFollowed by: 2 members; Thanked: 26 times; GMAT Score:760

by mj78ind » Thu Jan 26, 2012 8:11 am

sud21 wrote:G and R went to a same position for a picnic. G went by bike and R drove a car. Did R arrive there earlier than G?
1). G start out 30 minutes earlier than R
2). The speed of G is 10m/h, and the speed of R is 30 m/h

Stmt 1 - G could be starting much farther or nearer than R, and the speeds are also unknown. Hence INSUFFICIENT.

Stmt 2 - G has to cover a total of 0.1 miles more and R 10 miles, G reaches faster, similarly flip that and R reaches first. INSUFFICIENT.

Stmt 1 and 2 - essentially G has a lead of 5 miles over R. If the total distance for G and R is 6 miles. G reaches faster, however if total distance is 30 miles R reaches first. INSUFFICIENT.

Hence E

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ArunangsuSahu: Master | Next Rank: 500 Posts; Posts: 382; Joined: Thu Mar 31, 2011 5:47 pm; Thanked: 15 times

by ArunangsuSahu » Thu Jan 26, 2012 9:51 am

First of all we don't know if the starting point is same or not

(E) is the answer

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