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26 Jan 2024, 01:23
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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:
25%
(medium)
Question Stats:
77% (01:39) correct
23%
(01:56)
wrong
based on 472
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If a salesperson drove 220 miles nonstop in 4 hours and 15 minutes, which of the following is closest to the salesperson's average speed, in miles per hour?
A. 47.2
B. 48.3
C. 50.6
D. 51.8
E. 55.5
2024-01-26_12-06-40.png [ 32.61 KiB | Viewed 5015 times ]
A. 47.2
B. 48.3
C. 50.6
D. 51.8
E. 55.5
Attachment:
2024-01-26_12-06-40.png [ 32.61 KiB | Viewed 5015 times ]
26 Jan 2024, 01:32
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guddo
If a salesperson drove 220 miles nonstop in 4 hours and 15 minutes, which of the following is closest to the salesperson's average speed, in miles per hour?
A. 47.2
B. 48.3
C. 50.6
D. 51.8
E. 55.5
A. 47.2
B. 48.3
C. 50.6
D. 51.8
E. 55.5
Attachment:
2024-01-26_12-06-40.png
4 hours and 15 minutes is \(4\frac{1}{4}=\frac{17}{4}\) hours.
We need, therefore, to find the value of \(\frac{220}{(\frac{17}{4})}=\frac{2204}{17}\). Essentially, the question boils down to how to approximate \(\frac{2204}{17}\) quickly and effectively.
Let's check multiples of 17. We have 170 = 10*17 and 51 = 3*17, which sum up to 221. Thus, \(\frac{220*4}{17}\approx \frac{221*4}{17}=13*4=52\).
Answer: D.
26 Jan 2024, 22:32
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guddo
If a salesperson drove 220 miles nonstop in 4 hours and 15 minutes, which of the following is closest to the salesperson's average speed, in miles per hour?
A. 47.2
B. 48.3
C. 50.6
D. 51.8
E. 55.5
4 hours and 15 minutes = 4Hours + 15/60 Hour = 4.25 HoursA. 47.2
B. 48.3
C. 50.6
D. 51.8
E. 55.5
Attachment:
2024-01-26_12-06-40.png
THus avg speed = 220/4.25 ~ 51.8, Answer must be (D)
