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How long did it take Carlos to drive nonstop from his home [#permalink]

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15 Mar 2012, 14:13

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E

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45% (medium)

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56% (01:54) correct
44% (00:49) wrong based on 318 sessions

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How long did it take Carlos to drive nonstop from his home to Atlanta, Georgia?

(1) Carloss average speed for the trip was 55 miles per hour. (2) If Carloss average speed for the trip had been 20 percent faster, the trip wouldve taken 3 hours.

Statement 1 We dont know the distance so we cannot calculate T

Statement 2 IF we apply ratios we can solve it easily. New velocity is 1.2 (6/5) times the old velocity i.e if velocity has increased 6/5 times then time to cover the same distance will reduce to 5/6 times. so we can write that 5/6T(old time taken)=3(new time taken) so T(old)=3.6 hrs

so from statement 2 we know the time taken so the ANS is B

How long did it take Carlos to drive nonstop from his home to Atlanta, Georgia?

Distance=Rate*Time

(1) Carloss average speed for the trip was 55 miles per hour --> Rate=55 miles per hour, we still need Distance to get Time. Not sufficient.

(2) If Carloss average speed for the trip had been 20 percent faster, the trip wouldve taken 3 hours --> notice that we are dealing with the SAME distance: Distance=Rate*Time=(1.2*Rate)*3 --> Rate*Time=(1.2*Rate)*3 --> Time=3.6 hours. Sufficient.

Re: How long did it take Carlos to drive nonstop from his home [#permalink]

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24 May 2016, 22:56

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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