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13 May 2025, 00:30
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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:
96% (01:03) correct
4%
(00:59)
wrong
based on 55
sessions
History
Date
Time
Result
Not Attempted Yet
Did Jon complete a journey of 40 kilometers in less time than it took Ann to complete the same journey?
(1) Jon traveled at an average speed of 30 kilometers per hour for the first 10 kilometers and then at an average speed of 15 kilometers per hour for the rest of the journey.
(2) Ann traveled at an average speed of 20 kilometers per hour for the entire journey.
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
(1) Jon traveled at an average speed of 30 kilometers per hour for the first 10 kilometers and then at an average speed of 15 kilometers per hour for the rest of the journey.
(2) Ann traveled at an average speed of 20 kilometers per hour for the entire journey.
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
13 May 2025, 01:05
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D = 40
Was Jon faster?
S1
d1 = 10 at 30km/h
d2 = 30 at 15km/h
Avg speed = 75/4 = ~19km/h
But we don't know the avg speed for Ann and don't know if Jon took a break after 10kms
Insufficient
S2
Ann's speed = 20km/h
But we don't know the avg speed for Jon
Insufficient
Together:
Speed of Ann is greater. Ans it doesn't matter if Jon took a break. He will be slower regardless
Answer C
Was Jon faster?
S1
d1 = 10 at 30km/h
d2 = 30 at 15km/h
Avg speed = 75/4 = ~19km/h
But we don't know the avg speed for Ann and don't know if Jon took a break after 10kms
Insufficient
S2
Ann's speed = 20km/h
But we don't know the avg speed for Jon
Insufficient
Together:
Speed of Ann is greater. Ans it doesn't matter if Jon took a break. He will be slower regardless
Answer C
Bunuel
13 May 2025, 11:02
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Let’s determine if Jon completed a 40-km journey in less time than Ann by evaluating the statements.
We need to compare \(T_{Jon} < T_{Ann}\) for the 40-km journey.
Combining both statements gives us the times for Jon and Ann, allowing us to compare.
Answer: C
We need to compare \(T_{Jon} < T_{Ann}\) for the 40-km journey.
| Statement | Information Provided | Sufficiency |
| Statement 1 | Jon: 10 km at 30 km/h, then 30 km at 15 km/h. Time = \(\frac{10}{30} + \frac{30}{15} = \frac{1}{3} + 2 = \frac{7}{3}\) hours. No info on Ann. | Insufficient to compare. |
| Statement 2 | Ann: 40 km at 20 km/h. Time = \(\frac{40}{20} = 2\) hours. No info on Jon. | Insufficient to compare. |
| Statements 1 + 2 | Jon: \(\frac{7}{3} \approx 2.333\) hours. Ann: \(2\) hours. | Sufficient to compare. |
Combining both statements gives us the times for Jon and Ann, allowing us to compare.
Answer: C
