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26 Jun 2018, 21:11
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C
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:
76% (00:57) correct
24%
(01:04)
wrong
based on 127
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A certain train is traveling at a constant rate. If the train travels s miles in t hours, in how many hours will the train travel y miles?
A. \(\frac{sy}{t}\)
B. \(\frac{st}{y}\)
C. \(\frac{ty}{s}\)
D. \(\frac{s}{ty}\)
E. \(\frac{s+y}{t}\)
A. \(\frac{sy}{t}\)
B. \(\frac{st}{y}\)
C. \(\frac{ty}{s}\)
D. \(\frac{s}{ty}\)
E. \(\frac{s+y}{t}\)
26 Jun 2018, 22:36
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Bunuel
A certain train is traveling at a constant rate. If the train travels s miles in t hours, in how many hours will the train travel y miles?
A. \(\frac{sy}{t}\)
B. \(\frac{st}{y}\)
C. \(\frac{ty}{s}\)
D. \(\frac{s}{ty}\)
E. \(\frac{s+y}{t}\)
A. \(\frac{sy}{t}\)
B. \(\frac{st}{y}\)
C. \(\frac{ty}{s}\)
D. \(\frac{s}{ty}\)
E. \(\frac{s+y}{t}\)
As the calculation we're asked to do is relatively straightforward, we'll just do it.
This is a Precise approach.
We're told that the train traveled s miles in t hours, that is it traveled s/t miles per hour.
Since distance = time * speed, then y = time * s/t and our answer is yt/s
(C) is our answer
T
26 Jun 2018, 22:37
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Solution
Given:
- • A certain train is traveling at a constant rate
• The train travels s miles in t hours
- o Hence, speed of the train = \(\frac{s}{t}\) miles per hour
To find:
- • The time the train will take to travel y miles
Approach and Working:
As the speed of the train is \(\frac{s}{t}\) mph,
- • The time the train will take to travel y miles = y/(s/t) hours = \(\frac{ty}{s}\) hours
Hence, the correct answer is option C.
Answer: C
