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by raunakrajan » Thu Jul 15, 2010 9:55 pm
How long did the 1000mile journey with 10 stopovers take Mr. X

1.) The i th stopover lasted i^2 minutes.

2.) The average speed between any two stopovers was 66 miles per hour.



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Source: — Data Sufficiency |
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by gmatmachoman » Thu Jul 15, 2010 10:37 pm
raunakrajan wrote:How long did the 1000mile journey with 10 stopovers take Mr. X

1.) The i th stopover lasted i^2 minutes.

2.) The average speed between any two stopovers was 66 miles per hour.



OA C
S * T = D

Stem asks us to find "time taken"

st 1 : Does NOT give Speed..Insufficient

St 2: I am not able to figure out the meaning of the st2.

Case 1: Stopover 1 & Stopover 2 : Avg speed 66 miles per hour.

case 2: Stopover 1 & Stopover 10 : Avg speed 66 miles per hour.

Is that so???
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by Testluv » Fri Jul 16, 2010 12:33 am
Yeah, that's right Govi. Basically, (2) is telling us that the speed is constant. From (1) we can compute the total time at all of the stops. From (2), we can compute total time taken while travelling. The sum of those 2 would give us total time overall.
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by raunakrajan » Fri Jul 16, 2010 1:01 am
Testluv wrote:Yeah, that's right Govi. Basically, (2) is telling us that the speed is constant. From (1) we can compute the total time at all of the stops. From (2), we can compute total time taken while travelling. The sum of those 2 would give us total time overall.
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by indiantiger » Sat Jul 17, 2010 11:53 am
1.) The i th stopover lasted i^2 minutes.
>> insufficient as it does not give any thing about the time spent on the road.

2.) The average speed between any two stopovers was 66 miles per hour
>>insufficient as it does provide any detail for the time spent in stopovers

combine 1 and 2

you get the total time spend in covering 1000 miles : total time spent in stopovers + total time spent on the road.
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by debmalya_dutta » Sat Jul 17, 2010 12:43 pm
Agree with @indiantiger

The total journey time consists of total stopover time + total on the road time

Statement 1 can be used to find the total stopover time
Statement 2 can be used to find the total on the road time (distance between consecutive stop overs = 1000/10 and covered at 66mph)

Hence using both the statement , we can find the total time
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