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09 May 2018, 03:34
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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:
81% (01:05) correct
19%
(01:22)
wrong
based on 1126
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If snow accumulation increased at a constant rate of 30 millimeters per hour during a certain snowstorm, how many seconds did it take for snow accumulation to increase by 1 millimeter?
A. 1/120
B. 1/60
C. 1/20
D. 20
E. 120
A. 1/120
B. 1/60
C. 1/20
D. 20
E. 120
09 May 2018, 07:08
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alanforde800Maximus
If snow accumulation increased at a constant rate of 30 millimeters per hour during a certain snowstorm, how many seconds did it take for snow accumulation to increase by 1 millimeter?
a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
Let's keep listing EQUIVALENT RATES until we get to 1 millimeter
30 millimeters per hour = 30 millimeters per 60 minutes
= 30 millimeters per 3600 SECONDS
= 3 millimeters per 360 SECONDS
= 1 millimeter per 120 SECONDS
Answer: E
Cheers,
Brent
General Discussion
09 May 2018, 08:59
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alanforde800Maximus
If snow accumulation increased at a constant rate of 30 millimeters per hour during a certain snowstorm, how many seconds did it take for snow accumulation to increase by 1 millimeter?
a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
I suspect the trap answer is A. It is easy to overlook units. a) 1/120
b) 1/60
c) 1/20
d) 20
e) 120
Shortcut: 1 hour = 3600 seconds
\(\frac{30mm}{1hour}=\frac{30mm}{3600secs}=\frac{1mm}{120secs}\)
Units are not the same. The answer is not A. In 120 seconds, 1mm of snow will accumulate.
Answer E
No shortcut: \((\frac{30mm}{1hour}*\frac{1hour}{60mins}*\frac{1min}{60secs})=\frac{30mm}{(60*60)secs}=\frac{30mm}{3600secs}\)
In the parentheses, hours and minutes cancel. Factor out 30, write the final units: \(\frac{1mm}{120secs}\)
Answer E
