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16 Mar 2021, 06:18
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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:
15%
(low)
Question Stats:
84% (02:12) correct
16%
(02:35)
wrong
based on 624
sessions
History
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A certain bridge is 4,224 feet long. What constant rate, in miles per hour, must be maintained in order to walk across the bridge in 12 minutes? (1 mile = 5,280 feet)
A. 0.96
B. 1.5
C. 1.6
D. 4.0
E. 5.0
A. 0.96
B. 1.5
C. 1.6
D. 4.0
E. 5.0
16 Mar 2021, 19:01
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Given: Length of bridge = 4224 feet, Time to walk across the bridge = 12 minutes.
Constant rate or speed (r) = \(\frac{4224}{12}\) \(\frac{feet}{minutes}\).
We are asked the rate in \(\frac{miles}{hour}\):
So, 5280 feet = 1 mile
=> 4224 feet = \(\frac{4224 * 1}{5280}\) mile
Also, 60 minutes = 1 hour
=> 12 minutes = \(\frac{12 * 1}{60}\)hour
r = \(\frac{4224 * 60}{12 * 5280}\) \(\frac{miles}{hour}\) = 4.0 \(\frac{miles}{hour}\)
So, correct answer is option D.
Constant rate or speed (r) = \(\frac{4224}{12}\) \(\frac{feet}{minutes}\).
We are asked the rate in \(\frac{miles}{hour}\):
So, 5280 feet = 1 mile
=> 4224 feet = \(\frac{4224 * 1}{5280}\) mile
Also, 60 minutes = 1 hour
=> 12 minutes = \(\frac{12 * 1}{60}\)hour
r = \(\frac{4224 * 60}{12 * 5280}\) \(\frac{miles}{hour}\) = 4.0 \(\frac{miles}{hour}\)
So, correct answer is option D.
21 Mar 2021, 17:20
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