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14 Mar 2016, 07:21
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Difficulty:
5%
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Question Stats:
93% (01:16) correct
7%
(01:26)
wrong
based on 421
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Jim travels the first 3 hours of his journey at 60 mph speed and the remaining 5 hours at 24 mph speed. What is the average speed of Jim's travel in mph?
A. 36 mph
B. 37.5 mph
C. 42 mph
D. 42.5 mph
E. 48 mph
A. 36 mph
B. 37.5 mph
C. 42 mph
D. 42.5 mph
E. 48 mph
22 Mar 2016, 11:21
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First of all you cannot just add up the speed and divide by the total hours. You have to find the total combined time and total distance for the trip.
Therefore, it is helpful to refer to a table such as the one below.
Since the total distance is 300 miles and the total amout of hours is 8, one can solve for the average speed
\(\frac{300}{8}=37.5 mph\)
Answer is B)
Therefore, it is helpful to refer to a table such as the one below.
Since the total distance is 300 miles and the total amout of hours is 8, one can solve for the average speed
\(\frac{300}{8}=37.5 mph\)
Answer is B)
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