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Beth lives 40 blocks from her office. To get to work, she can walk,

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Beth lives 40 blocks from her office. To get to work, she can walk,  [#permalink]

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New post 06 Jan 2019, 06:22
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

87% (01:42) correct 13% (01:37) wrong based on 30 sessions

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Beth lives 40 blocks from her office. To get to work, she can walk, which takes 45 seconds per block, or she can take the subway, which takes z seconds per block. If she could wait for the subway for 20 minutes and arrive at her office at exactly the same time she would have arrived by walking, then z is

A) 10
B) 13
C) 14
D) 15
E) 20

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Re: Beth lives 40 blocks from her office. To get to work, she can walk,  [#permalink]

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New post 06 Jan 2019, 07:29
By walk = 45 seconds per block, then for 45 blocks, 1800 seconds.
By subway = z seconds per block, then 40z seconds for 40 blocks.

1800 = 20min + 40z
1800 = 20*60 + 40z
40z = 600
z = 15

D is the answer.
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Re: Beth lives 40 blocks from her office. To get to work, she can walk, &nbs [#permalink] 06 Jan 2019, 07:29
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Beth lives 40 blocks from her office. To get to work, she can walk,

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