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21 Sep 2015, 09:04
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
84% (02:06) correct
16%
(02:32)
wrong
based on 330
sessions
History
Date
Time
Result
Not Attempted Yet
Youseff lives x blocks from his office. It takes him 1 minute per block to walk to work and 20 seconds per block to ride his bike to work. It is takes him exactly 10 minutes more to walk to work than to ride his bike to work, then x equals?
A. 4
B. 7
C. 10
D. 15
E. 20
A. 4
B. 7
C. 10
D. 15
E. 20
Henrikh lives x blocks from his office. It takes him 1 minute per block to walk to work and 20 seconds per block to ride his bicycle to work. If it takes him exactly 10 minutes more to walk to work than to ride his bicycle, then x equals
A. 4
B. 7
C. 10
D. 15
E. 20
oa is d
I have solved it, by using backsolving but i tried one other method please tell me where am i wrong. I am not reasoning in minutes but in seconds and the result it is not the same
X/60-X/20 = 600
A. 4
B. 7
C. 10
D. 15
E. 20
oa is d
I have solved it, by using backsolving but i tried one other method please tell me where am i wrong. I am not reasoning in minutes but in seconds and the result it is not the same
X/60-X/20 = 600
ENGRTOMBA2018
Joined: 20 Mar 2014
Last visit: 01 Dec 2021
Posts: 2,319
Given Kudos: 816
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE:Engineering (Aerospace and Defense)
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21 Sep 2015, 10:08
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siriusvj
Please follow posting guidelines, link is in my signatures.
As for your question, x/60 = blocks/time/block = block^2/time . This is not what you want. You are given x blocks and 60 seconds PER BLOCK. Thus you need to put it as 60*x to give you units of seconds as you are equating this to 600 (which is TIME in seconds.).
Thus the correct equation is : 60*x-20*x=600 ----> 40x=600--> x = 15.
General Discussion
21 Sep 2015, 15:59
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Hi siriusvj,
This question can be solved by TESTing THE ANSWERS.
We're given Youseff's rate to walk (1 minute/block) and bike (20 seconds/block = 1/3 minute/block) to work. We're also told that the DIFFERENCE in those two times is exactly 10 minutes. We're asked for the number of blocks between Youseff's home and work.
Since the DIFFERENCE is 10 minutes, and the walking rate is 1 minute/block, there MUST be MORE than 10 blocks (since 10 blocks = 10 minutes to walk and it takes a certain amount of time to bike, so the difference in time would be less than 10 minutes).
Let's TEST Answer D:
IF....15 blocks....
15(1 min/block) = 15 minutes to walk
15(1/3 min/block) = 5 minutes to bike
The difference IS 10 minutes, which is a MATCH for what we were told, so this MUST be the answer.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
This question can be solved by TESTing THE ANSWERS.
We're given Youseff's rate to walk (1 minute/block) and bike (20 seconds/block = 1/3 minute/block) to work. We're also told that the DIFFERENCE in those two times is exactly 10 minutes. We're asked for the number of blocks between Youseff's home and work.
Since the DIFFERENCE is 10 minutes, and the walking rate is 1 minute/block, there MUST be MORE than 10 blocks (since 10 blocks = 10 minutes to walk and it takes a certain amount of time to bike, so the difference in time would be less than 10 minutes).
Let's TEST Answer D:
IF....15 blocks....
15(1 min/block) = 15 minutes to walk
15(1/3 min/block) = 5 minutes to bike
The difference IS 10 minutes, which is a MATCH for what we were told, so this MUST be the answer.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
