During a 40 mile trip, mara travelled at an ave speed of x : GMAT Data Sufficiency (DS)
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# During a 40 mile trip, mara travelled at an ave speed of x

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Manager
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During a 40 mile trip, mara travelled at an ave speed of x [#permalink]

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26 Nov 2006, 14:57
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Difficulty:

95% (hard)

Question Stats:

38% (02:36) correct 62% (01:33) wrong based on 168 sessions

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During a 40 mile trip, mara travelled at an ave speed of x miles/hr for the first y miles and at an average speed of 1.25 miles/hr for the last 40-y miles of the trip. The time that mara took to travel the 40 miles was what percent of the time it would have taken her if she had travelled at an ave speed of x miles/hr for the entire trip?

(1) x = 48
(2) y = 20

OPEN DISCUSSION OF THIS QUESTION IS HERE: during-a-40-mile-trip-marla-traveled-at-an-average-speed-of-93367.html
[Reveal] Spoiler: OA
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26 Nov 2006, 18:48
C for me.

I got (1.25y + 40x - xy)/40*1.25.

so obviously I need both x and y.
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26 Nov 2006, 22:51
C...need both x and y
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27 Nov 2006, 15:25
During a 40 mile trip, mara travelled at an ave speed of x miles/hr for the first y miles and at an average speed of 1.25 miles/hr for the last 40-y miles of the trip. The time that mara took to travel the 40 miles was what percent of the time it would have taken her if she had travelled at an ave speed of x miles/hr for the entire trip?

1. x = 48
2. y = 20

total time = y/x (1st half) + (40-y)/1.25 (2nd half)= (1.25y+40-y)/1.25x

time at x miles = 40/x

% (0.25y+40)/1.25x devided by 40/x
= (0.25y+40)*x/(40*1.25x)

x xancels out
need only Y

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28 Nov 2006, 00:39
Damager wrote:
[color=blue]
total time = y/x (1st half) + (40-y)/1.25 (2nd half)= (1.25y+40-y)/1.25x

Actually this one should be (1.25y + 40x - xy)/1.25x

C here as well.
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Re: During a 40 mile trip, mara travelled at an ave speed of x [#permalink]

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27 Feb 2013, 03:08
Is the answer B or c for this one?
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Re: During a 40 mile trip, mara travelled at an ave speed of x [#permalink]

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27 Feb 2013, 05:33
1
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Expert's post
fozzzy wrote:
Is the answer B or c for this one?

OA is B.

OPEN DISCUSSION OF THIS QUESTION IS HERE: during-a-40-mile-trip-marla-traveled-at-an-average-speed-of-93367.html
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Re: During a 40 mile trip, mara travelled at an ave speed of x [#permalink]

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01 Apr 2013, 14:20
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The question is not transcribed correctly . The speed for the (40-y) distance is 1.25x and not just 1.25mph. I spent quiet sometime on the above doubts too.
Request the moderator to edit the question to prevent further users from wasting time in figuring this out.
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Jyothi hosamani

Re: During a 40 mile trip, mara travelled at an ave speed of x   [#permalink] 01 Apr 2013, 14:20
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