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# Will Laurie get to the apartment building before Ernest if they both

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Math Expert
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Will Laurie get to the apartment building before Ernest if they both [#permalink]

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09 May 2017, 02:03
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Will Laurie get to the apartment building before Ernest if they both embark at the same time?

(1) Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks.
(2) Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building.
[Reveal] Spoiler: OA

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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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09 May 2017, 10:54
stat1: no info about ernesst,,,not suff

stat2: no info about mode of transport used by laurie.. not suff

both combined,, no concrete info,,,hence E

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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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10 May 2017, 00:46
IMO C

Both tell us that relative time to reach the building

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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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10 May 2017, 07:30
Bunuel wrote:
Will Laurie get to the apartment building before Ernest if they both embark at the same time?

(1) Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks.
(2) Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building.

I'll go with option C.

Assumptions: Laurie is not Flash from DC so his walking speed is not faster than taxi's speed.

Laurie and Ernest will reach the apartment together only if they travel for a same time period 'T' via subway and taxi respectively.
Apart from travelling by taxi, Laurie has to walk 3 blocks so the time taken to walk will be included in Laurie's total time taken.
Either ways Laurie won't reach the apartment before Ernest does.

Cheers!

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Will Laurie get to the apartment building before Ernest if they both [#permalink]

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10 May 2017, 19:42
Diwakar003 wrote:

his walking speed is not faster than taxi's speed.

IMHO we can not make this kind of assumptions. So the answer should be E

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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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16 May 2017, 02:59
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IMO C
From the given info car speed is X then subway speed is 2X . If Laurie distance is Y then Ernest distance is Y/2
Time taken by Laurie time= Y/2x
Time taken by Ernest = (Y/2 ) / X

SO both traveled same time but Laurie have to walk while Ernest reached to building
SO Ernest will reach earlier.

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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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16 May 2017, 06:56
Bunuel wrote:
Will Laurie get to the apartment building before Ernest if they both embark at the same time?

(1) Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks.
(2) Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building.

Are we not assuming here walking is slowest of all methods of transport, which may empirically be correct but an assumption GMAT usually discourages. Maybe I am missing the point where we can prove Laurie will be slower without assuming the time added by the walk.
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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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16 May 2017, 10:57
Both of them would reach at the same time given they choose the same mode of transport.

Apart from travelling by taxi, Laurie has to walk 3 blocks so the time taken to walk will be included in Laurie's total time taken. Either ways Laurie won't reach the apartment before Ernest does.

Hence option C

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Will Laurie get to the apartment building before Ernest if they both [#permalink]

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16 May 2017, 19:17
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Bunuel wrote:
Will Laurie get to the apartment building before Ernest if they both embark at the same time?

(1) Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks.
(2) Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building.

Car speed is 'x' then subway speed is '2x' . If Laurie distance is 'y' then Ernest distance is 'y/2'
Time taken by Laurie time= y/2x + extra time to cover 3blocks(whatever it maybe, say 'z')= t+z
Time taken by Ernest = (y/2 )/x = y/2t = t

As, both started embarking at the same time, so, Ernest will reach earlier.
Hence, (1) & (2) together are sufficient.
Hope it helps

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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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02 Jun 2017, 23:23
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Lithium wrote:
Bunuel wrote:
Will Laurie get to the apartment building before Ernest if they both embark at the same time?

(1) Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks.
(2) Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building.

Car speed is 'x' then subway speed is '2x' . If Laurie distance is 'y' then Ernest distance is 'y/2'
Time taken by Laurie time= y/2x + extra time to cover 3blocks(whatever it maybe, say 'z')= t+z
Time taken by Ernest = (y/2 )/x = y/2t = t

You've already assumed that laurie has covered the full distance to the apartment building by subway y/2x . thus the addition of "time to cover 3 blocks walking", z, in y/2x + z actually implies that she got to the apartment at subway speed and then walked 3 blocks further). There is no way to solve this problem without assuming that laurie walks slower than the taxi. A reasonable assumption, but an assumption nonetheless.

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Re: Will Laurie get to the apartment building before Ernest if they both [#permalink]

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03 Jun 2017, 21:23
Bunuel wrote:
Will Laurie get to the apartment building before Ernest if they both embark at the same time?

(1) Laurie will take the subway, which is twice as fast as a taxi, then she will walk 3 blocks.
(2) Ernest who is 2 times closer to the apartment building than Laurie will take a taxi to the building.

Let the distance be D.

1) Time taken by Laurie is $$(D/S) + Tb$$ (S is speed of subway, Tb is time to walk 3 blocks, Also given that S = 2 * T, where T is the speed of Taxi). No info about Ernest hence insufficient

2) Time taken by Ernest is D*2/S*2 = D/S, No info about Laurie hence insufficient

Combining both, We can get the answer C
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Will Laurie get to the apartment building before Ernest if they both [#permalink]

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24 Oct 2017, 10:31
Hi I have one question, Eventhough Ernest is closer to apartment building, what if ernest is in opposite route to Laurie, and that route is full of traffic?

Laurie -----------2x-------------- Apartment-------------------x(but full of traffic)-----Ernest

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Will Laurie get to the apartment building before Ernest if they both   [#permalink] 24 Oct 2017, 10:31
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