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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.

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.

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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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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.

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

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.

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