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# A turtle is crossing a field, how many meters total did he

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Senior Manager
Joined: 20 Jan 2010
Posts: 278
Schools: HBS, Stanford, Haas, Ross, Cornell, LBS, INSEAD, Oxford, IESE/IE
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Kudos [?]: 142 [0], given: 117

A turtle is crossing a field, how many meters total did he [#permalink]  05 Mar 2010, 23:34
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Question Stats:

56% (01:17) correct 44% (01:42) wrong based on 18 sessions
Plzz! solve & explain following questions.

A turtle is crossing a field, how many meters total did he pass?
(1) The average speed of the turtle is 2 meters per minute.
(2) Had the turtle walked 1 meter per minute faster than his average speed it would have finished the same path 40 minutes earlier.

OA
[Reveal] Spoiler:
C

If Q and T are integers, what is the value of Q?
(1) Q = 2T/7.
(2) T+7/2 = 7(Q+2)/4

OA
[Reveal] Spoiler:
E

Is the square root of A an integer?
(1) The last digit of A is 8 .
(2) A is divisible by 6.
OA
[Reveal] Spoiler:
A

_________________

"Don't be afraid of the space between your dreams and reality. If you can dream it, you can make it so."
Target=780
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Kudos??

Math Expert
Joined: 02 Sep 2009
Posts: 23055
Followers: 3535

Kudos [?]: 27190 [1] , given: 2725

Re: DS questions [#permalink]  06 Mar 2010, 05:07
1
KUDOS
Expert's post
A turtle is crossing a field, how many meters total did he pass?
(1) The average speed of the turtle is 2 meters per minute.
(2) Had the turtle walked 1 meter per minute faster than his average speed it would have finished the same path 40 minutes earlier.

d=rt, where d is the distance covered, r rate and t time. Question: d=?
(1) r=2. Clearly not sufficient.
(2) (r+1)(t-40)=d. Clearly not sufficient.

(1)+(2) r=2 and (r+1)(t-40)=d --> 3(t-40)=d, t=\frac{d+120}{3} --> d=rt=2\frac{d+120}{3} --> d=240. Sufficient.

If Q and T are integers, what is the value of Q?
(1) q=\frac{2t}{7}. --> 7q=2t. Not sufficient to calculate the value of q.
(2) \frac{t+7}{2}=\frac{7(q+2)}{4} --> 2t+14=7q+14 --> 7q=2t. Same info as above not sufficient.

(1)+(2) Nothing new. Not sufficient.

Is the square root of A an integer?
Question: is \sqrt{a}=int true? Or is int^2=a true?

(1) The last digit of A is 8 --> integer raised to the power of two can not end with 8 (it can end only with 0, 1, 4, 5, 6, 9). So a is not the square of an integer. Sufficient.

(2) A is divisible by 6. If a=6, \sqrt{a}\neq{int} BUT if a=36, \sqrt{a}=\sqrt{36}=6={int}. Two different answers, not sufficient.

_________________
Senior Manager
Joined: 20 Jan 2010
Posts: 278
Schools: HBS, Stanford, Haas, Ross, Cornell, LBS, INSEAD, Oxford, IESE/IE
Followers: 14

Kudos [?]: 142 [0], given: 117

Re: DS questions [#permalink]  06 Mar 2010, 05:59
Thanks for the explanation guys!
Really appreciated.
And yea, nitish you are right it's a typo mistake thank you for indicating that.
_________________

"Don't be afraid of the space between your dreams and reality. If you can dream it, you can make it so."
Target=780
http://challengemba.blogspot.com
Kudos??

Re: DS questions   [#permalink] 06 Mar 2010, 05:59
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