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During a 40 mile trip, mara travelled at an ave speed of x

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During a 40 mile trip, mara travelled at an ave speed of x [#permalink] New post 26 Nov 2006, 14:57
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Question Stats:

35% (02:34) correct 65% (01:27) wrong based on 127 sessions
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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 [#permalink] New post 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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 [#permalink] New post 26 Nov 2006, 22:51
C...need both x and y
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[#permalink] New post 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

answer B
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Re: B [#permalink] New post 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] New post 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] New post 27 Feb 2013, 05:33
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Re: During a 40 mile trip, mara travelled at an ave speed of x [#permalink] New post 01 Apr 2013, 14:20
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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Re: During a 40 mile trip, mara travelled at an ave speed of x   [#permalink] 01 Apr 2013, 14:20
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