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Martha takes a road trip from point A to point B. She drives [#permalink]
14 May 2005, 05:43

00:00

A

B

C

D

E

Difficulty:

75% (hard)

Question Stats:

56% (03:02) correct
44% (02:11) wrong based on 210 sessions

Martha takes a road trip from point A to point B. She drives x percent of the distance at 60 miles per hour and the remainder at 50 miles per hour. If Martha's average speed for the entire trip is represented as a fraction in its reduced form, in terms of x, which of the following is the numerator?

Martha's Average Speed - Question 13 of Guide 2 [#permalink]
10 Nov 2011, 15:03

1

This post received KUDOS

Martha takes a road trip from point A to point B. She drives x percent of the distance at 60 miles per hour and the remainder at 50 miles per hour. If Martha's average speed for the entire trip is represented as a fraction in its reduced form, in terms of x, which of the following is the numerator?

A)110 B) 300 C)1,100 D)3,000 E) 30,000

Guys - the answer for this question is not provided. I have calculated and got 30000 i.e. E. Can someone please tell me whether my answer is correct or incorrect? _________________

Re: Martha's Average Speed - Question 13 of Guide 2 [#permalink]
11 Nov 2011, 11:35

1

This post received KUDOS

BDSunDevil wrote:

i keep getting 30,000.

@ kostyan5: x% 0f D is xD/100, so t1 is xD/6000 isn't it? what am i doing wrong?

Yes, you are right. I didn't realize that percent (/100) doesn't cancel out at the end because there's on x in D. So we do need to express d1 and d2 in terms of x/100. I'm going to modify my solution above.

Re: Martha takes a road trip from point A to point B. She drives [#permalink]
04 Jul 2014, 02:34

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