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11 Jan 2021, 02:34
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E
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% (01:54) correct
16%
(01:44)
wrong
based on 149
sessions
History
Date
Time
Result
Not Attempted Yet
On a certain trip, a motorist drove 10 miles at 30 miles per hour, 10 miles at 40 miles per hour and 10 miles at 50 miles per hour. What portion of her total driving time was spent driving 50 miles per hour?
A. 64/51
B. 5/7
C. 5/12
D. 1/3
E. 12/47
A. 64/51
B. 5/7
C. 5/12
D. 1/3
E. 12/47
11 Jan 2021, 03:44
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Total time spent on journey = 10/30 + 10/40 + 10/50 = 20 minutes + 15 minutes + 12 minutes = 47 minutes
Motorist spent 12 minutes at 50 miles/hr speed.
The answer is E. 12/47
Motorist spent 12 minutes at 50 miles/hr speed.
The answer is E. 12/47
rocky620
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11 Jan 2021, 04:54
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Time taken to travel 10 miles @:
30mph = \(\frac{10}{30}\) = \(\frac{1}{3}\) hr = 20 mins
40mph = \(\frac{10}{40}\) = \(\frac{1}{4}\) hr = 15 mins
50mph = \(\frac{10}{50}\) = \(\frac{1}{5}\) hr = 12 mins
Total Time for the entire trip = 47 mins
%of trip traveled @ 50mph = \(\frac{12}{47}\)
Option E
30mph = \(\frac{10}{30}\) = \(\frac{1}{3}\) hr = 20 mins
40mph = \(\frac{10}{40}\) = \(\frac{1}{4}\) hr = 15 mins
50mph = \(\frac{10}{50}\) = \(\frac{1}{5}\) hr = 12 mins
Total Time for the entire trip = 47 mins
%of trip traveled @ 50mph = \(\frac{12}{47}\)
Option E
