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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:
78% (01:38) correct
22%
(01:52)
wrong
based on 625
sessions
History
Date
Time
Result
Not Attempted Yet
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 6535 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 6535 times ]
26 Jan 2024, 01:32
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guddo
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.
General Discussion
26 Jan 2024, 22:32
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guddo
4 hours and 15 minutes = 4Hours + 15/60 Hour = 4.25 Hours
THus avg speed = 220/4.25 ~ 51.8, Answer must be (D)
