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31 Dec 2020, 01:29
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
90% (01:04) correct
10%
(00:50)
wrong
based on 93
sessions
History
Date
Time
Result
Not Attempted Yet
Police suspected that motorists on a stretch of I-75 often exceeded the speed limit yet avoided being caught through the use of radar detectors and jammers. Officer Johnson of the State Police recently pulled over a driver on I-75 and accused him of breaking the 50 mile-per-hour speed limit. Is Officer Johnson’s assertion correct?
(1) Officer Johnson noted that the driver had traveled 30 miles from point A to point B on I-75.
(2) Officer Johnson noted that it took the driver 30 minutes to travel from point A to point B on I-75.
(1) Officer Johnson noted that the driver had traveled 30 miles from point A to point B on I-75.
(2) Officer Johnson noted that it took the driver 30 minutes to travel from point A to point B on I-75.
31 Dec 2020, 08:36
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The basic equation necessary for solving this problem is:
Distance = Rate*Time
D = RT
If Officer Johnson can prove that R, the driver’s average rate or speed, exceeded 50 miles-per-hour, Officer Johnson can prove that the driver broke the speed limit. We must be able to find R in order to definitively answer the question of whether Officer Johnson’s assertion is correct.
Statement 1:
Statement (1) says that D = 30 miles. Without information about T or R, we cannot find the value of R and, as a result, we cannot prove or disprove Officer Johnson's claim. So, Statement (1) alone is NOT SUFFICIENT.
Statement 2:
Statement (2) says that T = 30 minutes. Without information about D or R, we cannot find the value of R and, as a result, we cannot prove or disprove Officer Johnson's claim. So, Statement (2) alone is NOT SUFFICIENT.
Combining Statement 1 & 2:
From Statement 1: D = 30 miles
From Statement 2: T = 30 minutes
Putting the information together, we can construct the following algebraic equation:
D = RT
30mil = R(30min)
R = 1mil/1min = one mile per minute
R = One mile per minute * 60 minutes per hour = 60 miles per hour.
Since we have a value for R, we can definitively judge the veracity of Office Johnson's claim.
Statements (1) and (2), when taken together, are SUFFICIENT.
So, the answer is C
Distance = Rate*Time
D = RT
If Officer Johnson can prove that R, the driver’s average rate or speed, exceeded 50 miles-per-hour, Officer Johnson can prove that the driver broke the speed limit. We must be able to find R in order to definitively answer the question of whether Officer Johnson’s assertion is correct.
Statement 1:
Statement (1) says that D = 30 miles. Without information about T or R, we cannot find the value of R and, as a result, we cannot prove or disprove Officer Johnson's claim. So, Statement (1) alone is NOT SUFFICIENT.
Statement 2:
Statement (2) says that T = 30 minutes. Without information about D or R, we cannot find the value of R and, as a result, we cannot prove or disprove Officer Johnson's claim. So, Statement (2) alone is NOT SUFFICIENT.
Combining Statement 1 & 2:
From Statement 1: D = 30 miles
From Statement 2: T = 30 minutes
Putting the information together, we can construct the following algebraic equation:
D = RT
30mil = R(30min)
R = 1mil/1min = one mile per minute
R = One mile per minute * 60 minutes per hour = 60 miles per hour.
Since we have a value for R, we can definitively judge the veracity of Office Johnson's claim.
Statements (1) and (2), when taken together, are SUFFICIENT.
So, the answer is C
30 Mar 2026, 08:25
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Automated notice from GMAT Club BumpBot:
A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.
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A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.
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