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Had Frank driven at an averagespeed of 40 miles per hour, he would hav

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Manager
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Joined: 25 Dec 2018
Posts: 154
Location: India
Concentration: General Management, Finance
GMAT 1: 590 Q48 V23
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WE: Engineering (Consulting)
Had Frank driven at an averagespeed of 40 miles per hour, he would hav  [#permalink]

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New post 10 Mar 2019, 10:20
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A
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D
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Difficulty:

  45% (medium)

Question Stats:

57% (01:18) correct 43% (01:44) wrong based on 21 sessions

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Had Frank driven at an averagespeed of 40 miles per hour, he would have reached his office 10 minutes earlier than he usually did. At what average speed should Frank drive to reach his office 20 minutes earlier than he usually did?

(1) Frank usually takes 56 hours to reach his office

(2) The distance to his office is 803 miles

A)Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.

B)Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.

C)BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.

D)EACH statement ALONE is sufficient to answer the question asked.

E)Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
Director
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Re: Had Frank driven at an averagespeed of 40 miles per hour, he would hav  [#permalink]

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New post 10 Mar 2019, 10:42
1
From question. 40(t-10) = d and d = x(t-20)

From statement 1:

Time taken is 56*60 min. Enough to find d from 1st equation and eventually find the time required.
Hence Sufficient.

From statement 2:

d = 803 miles.
Again, time taken can be calculated from 1st equation. Hence we can find the speed.
Sufficient.

D is the answer.
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Re: Had Frank driven at an averagespeed of 40 miles per hour, he would hav   [#permalink] 10 Mar 2019, 10:42
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Had Frank driven at an averagespeed of 40 miles per hour, he would hav

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